UC Spark

Associate Professor Jon-Paul Renee Wells

Physics and Astronomy

Fields of Research

  • Free electron laser spectroscopy
  • Interferometry and applications
  • Optoelectronic materials
  • Ring lasers

Researcher Summary

Research interests include ring lasers, interferometry and applications, optoelectronic materials, and free electron laser spectroscopy.

Subject Area: Disciplines

Publications


  • Senanayake, P., Wells, J.-P.R., Reid, M.F., Berden, G., Meijerink, A. and Reeves, R.J. (2013) Impurity Trapped Excitons and Electron Traps in CaF2:Yb2+ and SrF2:Yb2+ Probed by Transient Photoluminescence Enhancement.. Journal of Luminescence 133: 81. (Journal Article)
  • Schreiber, K.U. and Wells, J.-P.R. (2013) Large Ring Lasers for Rotation Sensing. Review of Scientific Instruments 84: 041101. (Journal Article)
  • Senanayake, P.S., Wells, J-P.R., Reid, M.F., Berden, G., Meijerink, A. and Reeves, R.J. (2012) Electron trap liberation in MgF2 doped with Yb2+ using a two-color excitation experiment. Applied Physics Letters 100(4): 041902, 3pp. http://dx.doi.org/10.1063/1.3678630. (Journal Article)
  • Schreiber, K.U., Kluegel, T., Wells, J.-P., Holdaway, J., Gebauer, A. and Velikoseltsev,A. (2012) Enhanced Ring Lasers: A New Measurement Tool for Earth Sciences.. Quantum Electronics 42(11): 1045. (Journal Article)
  • Hughes-Currie, R.B., Reid, M.F., Wells, J-P.R., Ivanovskikh, K., Senanayake, P., Berden, G., Meijerink, A. and Reeves, R.J. (2012) FEL and synchrotron investigation of impurity-trapped excitons in two sites of Yb2+ doped NaMgF3. Udine, Italy: 8th International Conference on f-Elements (ICFE8), 26-31 Aug 2012. (Conference Contribution - Poster presentation)
  • Reid, M.F., Wells, J-P.R., Senanayake, P., Hughes-Currie, R., Ivanovskikh, K.V., Berden, G., Meijerink, A., Salkeld, A.J., Reeves, R.J. and Duan, C-K. (2012) Free-electron laser and synchrotron studies of impurity-trapped excitons in fluoride materials. Belgrade, Serbia: 3rd International Conference on the Physics of Optical Materials and Devices (ICOM), 3-6 Sep 2012. (Conference Contribution - Oral presentation)
  • Schreiber, K.U., Gebauer, A. and Wells, J-P.R. (2012) Long-term frequency stabilization of a 16 m(2) ring laser gyroscope. Optics Letters 37(11): 1925-1927. http://dx.doi.org/10.1364/OL.37.001925. (Journal Article)
  • Graham, R.D., Hurst, R.B., Schreiber, K.U. and Wells, J-P.R. (2012) Mode selection in an ultralarge ring laser gyro. Applied Optics 51(22): 5591-5595. http://dx.doi.org/10.1364/AO.51.005591. (Journal Article)
  • Velikoseltsev, A., Schreiber, K.U., Yankovsky, A., Wells, J-P.R., Boronachin, A. and Tkachenko, A. (2012) On the application of fiber optic gyroscopes for detection of seismic rotations. Journal of Seismology 16(4): 623-637. (Journal Article)
  • Yamaga, M., Uno, H., Tsuda, S., Wells, J-P.R. and Han, T.P.J. (2012) Resonant energy transfer and cross relaxation between Sm3+ ions in LiYF4 crystals. Journal of Luminescence 132(6): 1608-1617. http://dx.doi.org/10.1016/j.jlumin.2012.01.028. (Journal Article)
  • Holdaway, J., Hurst, R.B., Graham, R., Rabeendran, N., Schreiber, K.U. and Wells, J-P.R. (2012) Self-locked operation of large He-Ne ring laser gyroscopes. Metrologia 49(3): 209-212. http://dx.doi.org/10.1088/0026-1394/49/3/209. (Journal Article)
  • Reid, M.F., Wells, J-P.R., Senanayake, P., Hughes-Currie, R., Berden, G., Meijerink, A., Salkeld, A.J., Reeves, R.J. and Duan, C-K. (2012) Two-colour excitation of impurity-trapped excitons in fluoride materials doped with Yb2+. Udine, Italy: 8th International Conference on f-Elements (ICFE8), 26-31 Aug 2012. (Conference Contribution - Poster presentation)
  • Yamaga, M., Nakamura, T., Oda, Y., Wells, J-P.R. and Han, T.P.J. (2011) Dynamics and energy transfer of Sm2+ in KY3F10 crystals. Journal of Ceramic Processing Research 12(S3): s241-s245. (Journal Article)
  • Schreiber, K.U., Klügel, T., Wells, J-P.R., Hurst, R.B. and Gebauer, A. (2011) How to Detect the Chandler and the Annual Wobble of the Earth with a Large Ring Laser Gyroscope. Physical Review Letters 107(17): 173904, 4pp. http://dx.doi.org/10.1103/PhysRevLett.107.173904. (Journal Article)
  • Bosi, F., Cella, G., Di Virgilio, A., Ortolan, A., Porzio, A., Solimeno, S., Cerdonio, M., Zendri, J.P., Allegrini, M., Belfi, J., Beverini, N., Bouhadef, B., Carelli, G., Ferrante, I., Maccioni, E., Passaquieti, R., Stefani, F., Ruggiero, M.L., Tartaglia, A., Schreiber, K.U., Gebauer, A. and Wells, J-P.R. (2011) Measuring gravitomagnetic effects by a multi-ring-laser gyroscope. Physical Review D: Particles, fields, gravitation, and cosmology 84(12): 122002. http://dx.doi.org/10.1103/PhysRevD.84.122002. (Journal Article)
  • Reid, M.F., Senanayake, P.S., Wells, J-P.R., Berden, G., Meijerink, A., Salkeld, A.J., Duan, C-K. and Reeves, R.J. (2011) Transient photoluminescence enhancement as a probe of the structure of impurity-trapped excitons in CaF2:Yb2+. Physical Review B: Condensed Matter and Materials Physics 84(11): 113110, 4pp. http://dx.doi.org/10.1103/PhysRevB.84.113110. (Journal Article)
  • Di Virgillo, A., Schreiber, K.U., Gebauer, A., Wells, J-P.R., Tartaglia, A., Belfi, J., Beverini, N. and Ortolan, A. (2010) A Laser Gyroscope System to Detect the Gravito-Magnetic Effect on Earth. International Journal of Modern Physics D: Gravitation; Astrophysics and Cosmology 19(14): 2331-2343. http://dx.doi.org/10.1142/S0218271810018360. (Journal Article)
  • Reid, M.F., Wells, J-P., Reeves, R.J., Senanayake, P.S., Reynolds, A.J., Meijerink, A., Bellocchi, G., Berden, G., Redlich, B., van der Meer, L. and Duan, C-K. (2010) Excited-state structure and dynamics of high-energy states in lanthanide materials. Argonne, IL, USA: 17th International Conference on Dynamical Processes in Excited States of Solids (DPC '10), 20-25 Jun 2010. (Conference Contribution - Oral presentation)
  • Hurst, R.B., Stedman, G.E., Schreiber, K.U., Thirkettle, R.J., Graham, R.D., Rabeendran, N. and Wells, J-P.R. (2009) Experiments with an 834m2 ring laser interferometer. Journal of Applied Physics 105(11): 113115. http://dx.doi.org/10.1063/1.3133245. (Journal Article)
  • Wells, J-P.R. and Jones, G.D. (2009) Hyperfine Splittings and Zeeman Infrared Absorption of Tb3+ Doped CaF2 and SrF2. Physical Review B: Condensed Matter and Materials Physics 80(11): 115105. http://dx.doi.org/10.1103/PhysRevB.80.115105. (Journal Article)
  • Schreiber, K.U., Hautmann, J.N., Velikoseltsev, A., Wassermann, J., Igel, H., Otero, J., Vernon, F. and Wells, J-P.R. (2009) Ring Laser Measurements of Ground Rotations for Seismology. Bulletin of the Seismological Society of America 99(2B): 1190-1198. http://dx.doi.org/10.1785/0120080171. (Journal Article)
  • Schreiber, K.U., Klugel, T., Velikoseltsev, A., Schluter, W., Stedman, G.E. and Wells, J-P.R. (2009) The Large Ring Laser G for Continuous Earth Rotation Monitoring. Pure and Applied Geophysics 166(8-9): 1485. http://dx.doi.org/10.1007/s00024-004-0490-4. (Journal Article)
  • Murzyn, P., Garcia-Deniz, A.Z., Kundys, D.O., Fox, A.M., Wells, J-P.R., Whittaker, D.M., Skolnick, M.S., Krauss, T.F. and Roberts, J.S. (2006) Control of the nonlinear carrier response time of AlGaAs photonic crystal waveguides by sample design. Applied Physics Letters 88(14): 141104. http://dx.doi.org/10.1063/1.2191955. (Journal Article)
  • Bristow, A.D., Kundys, D.O., Garcia-Deniz, A.Z., Wells, J-P.R., Fox, A.M., Skolnick, M.S., Whittaker, D.M., Tahraoui, T.F., Krauss, T.F. and Roberts, J.S. (2006) Enhanced all-optical tuning of leaky eigenmodes in photonic crystal waveguides. Optics Letters 31(15): 2284-2286. http://dx.doi.org/10.1364/OL.31.002284. (Journal Article)
  • Brown, J., Wells, J-P.R., Hashemizadeh, S.A., Parbrook, P.J., Wang, T., Fox, A.M., Mowbray, D.J. and Skolnick, M.S. (2006) Fast spin relaxation in InGaN/GaN multiple quantum wells. Physica Status Solidi B: Basic Solid State Physics 243(7): 1643-1646. http://dx.doi.org/10.1002/pssb.200565271. (Journal Article)
  • Wells, J-P.R., Grinberg, M., Wynne, K. and Han, T.P.J. (2006) Femtosecond pump-probe measurements of non-radiative relaxation in LiAlO2:V3+. Journal of Physics: Condensed Matter 18(16): 3967-3974. http://dx.doi.org/10.1088/0953-8984/18/16/006. (Journal Article)
  • Sellars, I.R., Mowbray, D.J., Badcock, T.J., Wells, J-P.R., Phillips, P.J., Carder, D.A., Liu, H.Y., Groom, K.M. and Hopkinson, M. (2006) Infrared modulated interlevel spectroscopy of 1.3 μm self-assembled quantum dot lasers using a free electron laser. Applied Physics Letters 88(8): 081108. http://dx.doi.org/10.1063/1.2177656. (Journal Article)
  • Jobson, K.W., Wells, J.P.R., Schropp, R.E.I., Carder, D.A., Phillips, P.J. and Dijkhuis, J.I. (2006) Relaxation processes of the Ge-H stretch modes in hydrogenated amorphous germanium. Physical Review B: Condensed Matter and Materials Physics 73(15): 155202. http://dx.doi.org/10.1103/PhysRevB.73.155202. (Journal Article)
  • Kundys, D.O., Wells, J.P.R., Andreev, A.D., Hashemizadeh, S.A., Wang, T., Parbrook, P.J., Fox, A.M., Mowbray, D.J. and Skolnick, M.S. (2006) Resolution of discrete excited states in InxGa1-xN multiple quantum wells using degenerate four-wave mixing. Physical Review B: Condensed Matter and Materials Physics 73(16): 165309, 5pp. http://dx.doi.org/10.1103/PhysRevB.73.165309. (Journal Article)
  • Hashemizadeh, S.A., Wells, J-P.R., Brown, J., Murzyn, P., Jones, B.D., Wang, T., Parbrook, P.J., Fox, A.M., Mowbray, D.J. and Skolnick, M.S. (2006) Stimulated emission and carrier dynamics in AlInGaN multi-quantum wells. Physica Status Solidi C: Current Topics in Solid State Physics 3(6): 1958-1961. http://dx.doi.org/10.1002/pssc.200565370. (Journal Article)
  • Kundys, D.O., Murzyn, P., Wells, J-P.R., Tartakovskii, A.I., Skolnick, M.S., Dang, L.S., Lutsenko, E.V., Tarasuk, N.P., Lyublinskaya, O.G., Toropov, A.A. and Ivanov, S.V. (2006) The dynamics of amplified spontaneous emission in CdSe/ZnSe quantum dots. Journal of Applied Physics 100(12): 123510. http://dx.doi.org/10.1063/1.2402793. (Journal Article)
  • Jobson, K.W., Wells, J-P.R., Schropp, R.E.I., Carder, D.A., Phillips, P.J. and Dijkhuis, J.I. (2006) The similarities between amorphous silicon and germanium stretch mode dynamics. Lisbon, Portugal: 21st International Conference on Amorphous and Nanocrystalline Semiconductors, 4-9 Sep 2005. In Journal of Non-Crystalline Solids 352(9-20) 1268-1271. http://dx.doi.org/10.1016/j.jnoncrysol.2005.09.047. (Conference Contribution - Paper in published proceedings)
  • Jobson, K.W., Wells, J-P.R., Schropp, R.E.I., Carder, D.A., Phillips, P.J. and Dijkhuis, J.I. (2006) Time resolved spectroscopy of Ge-H stretching vibrations in hydrogenated amorphous germanium. Rathen, Germany: International Workshop on Infrared Microscopy and Spectroscopy with Accelerator-Based Sources, 26-30 Jun 2005. In Infrared Physics & Technology 49(1-2) 3-6. http://dx.doi.org/10.1016/j.infrared.2006.01.012. (Conference Contribution - Paper in published proceedings)
  • Olaizola, S.M., Fan, W.H., Hashemizadeh, S.A., Wells, J-P.R., Mowbray, D.J., Skolnick, M.S., Fox, A.M. and Parbrook, P.J. (2006) Time-resolved photoluminescence studies of carrier diffusion in GaN. Applied Physics Letters 89(7): 072107. http://dx.doi.org/10.1063/1.2335957. (Journal Article)
  • Garcia-Deniz, A.Z., Murzyn, P., Fox, A.M., Kundys, D.O., Wells, J-P.R., Whittaker, D.M., Skolnick, M.S., Krauss, T.F. and Roberts, J.S. (2006) Ultrafast reflectivity modulation in AlxGa1-xAs/InyAlxGa1-x-yAs multiple quantum well photonic crystal waveguides. Physical Review B: Condensed Matter and Materials Physics 74(16): 165327. http://dx.doi.org/10.1103/PhysRevB.74.165327. (Journal Article)
  • Jobson, K.W., Wells, J-P.R., Vinh, N.Q., Phillips, P.J., Pidgeon, C.R. and Dijkhuis, J.I. (2006) Vibrational relaxation pathways in porous silicon: A time-resolved infrared spectroscopic study. Physical Review B: Condensed Matter and Materials Physics 74(16): 165205. http://dx.doi.org/10.1103/PhysRevB.74.165205. (Journal Article)
  • Wells, J-P.R. and Jones, G.D. (2005) Dynamics of H- Local-Mode Vibrations in LaF3, CeF3, PrF3 and NdF3 Crystals. Physical Review B: Condensed Matter and Materials Physics 71(1): 014306 7 pp. http://dx.doi.org/10.1103/PhysRevB.71.014306. (Journal Article)
  • Hashemizadeh, S.A., Wells, J-P.R., Murzyn, P., Brown, J., Jones, B.D., Wang, T., Parbrook, P.J., Fox, A.M., Mowbray, D.J. and Skolnick, M.S. (2005) Picosecond Carrier Dynamics in AlInGaN Multiple Quantum Wells. Applied Physics Letters 87: 232106 3 pp. http://dx.doi.org/10.1063/1.2137990. (Journal Article)
  • Zibik, E.A., Wilson, L.R., Green, R.P., Bastard, G., Ferreira, R., Phillips, P.J., Carder, D.A., Wells, J-P.R., Skolnick, M.S., Cockburn, J.W., Steer, M.J. and Hopkinson, M. (2005) The polaronic nature of intraband relaxation in InAs/GaAs self-assembled quantum dots. Physica E: Low-dimensional Systems and Nanostructures 26(1-4): 408-412. http://dx.doi.org/10.1016/j.physe.2004.08.011. (Journal Article)
  • Murzyn, P., Garcia-Déniz, A.Z., Fox, A.M., Wells, J-P.R., Whittaker, D.M., Skolnick, M.S., Krauss, T.F. and Roberts, J.S. (2005) Ultrafast Nonlinear Response of AlGaAs/InAlGaAs MQW Photonic Crystal Waveguides. Physica Status Solidi (a) 202(14): 2653-2656. (Journal Article)
  • Zibik, E.A., Green, R.P., Wilson, L.R., Wells, J-P.R., Phillips, P.J., Carder, D.A., Cockburn, J.W., Steer, M.J. and Hopkinson, M. (2004) AlAs-like TO-phonon dephasing time in high Al content AlGaAs. Physica status solidi (c) 1(11): 2686-2689. (Journal Article)
  • Halsall, M.P., Zheng, W.M., Harrison, P., Wells, J.-P.R. and Steer, M.J. (2004) Binding energy and dynamics of Be acceptor levels in AlAs/GaAs multiple quantum wells. Journal of Luminescence 108(1-4): 181-184. http://dx.doi.org/10.1016/j.jlumin.2004.01.039. (Journal Article)
  • Wells, J.-P.R., Phillips, P.J., Tomozeiu, N., Habraken, F.H.P.M. and Dijkhuis, J.I. (2004) Degenerate Four-Wave Mixing Spectroscopy of Oxygen Vibrations in Amorphous Silicon. Journal of Luminescence 108: 173-176. http://dx.doi.org/10.1016/j.jlumin.2004.01.037. (Journal Article)
  • Tartakovskii, A.I., Cahill, J., Makhonin, M.N., Whittaker, D.M., Wells, J-P.R., Fox, A.M., Mowbray, D.J., Skolnick, M.S., Groom, K.M., Steer, M.J. and Hopkinson, M. (2004) Dynamics of Coherent and Incoherent Spin Polarisations in Ensembles of Quantum Dots. Physical Review Letters 93(5): 057401 (4pp). (Journal Article)
  • Tartakovskii, A.I., Makhonin, M.N., Sellars, I.R., Cahill, J., Andreev, A.D., Whittaker, D.M., Wells, J.-P.R., Fox, A.M., Mowbray, D.J., Skolnick, M.S., Groom, K.M., Steer, M.J., Liu, H.Y. and Hopkinson, M. (2004) Effect of Thermal Annealing and Strain Engineering on the Fine Structure of Quantum Dot Excitons. Physical Review B 70(19): 193303-193306. http://dx.doi.org/10.1103/PhysRevB.70.193303. (Journal Article)
  • Murzyn, P., Pidgeon, C.R., Phillips, P.J., Wells, J.-P.R., Gordon, N.T., Ashley, T., Jefferson, J.H., Burke, T.M., Giess, J., Merrick, M., Murdin, B.N. and Maxey, C.D. (2004) Electron Spin Lifetimes in Hg0.78Cd0.22Te and InSb. Physica E: Low-dimensional Systems and Nanostructures 20(3-4): 220-223. http://dx.doi.org/10.1016/j.physe.2003.08.007. (Journal Article)
  • Child, R.A., Nicholas, R.J., Mason, N.J., Shields, P., Wells, J.-P.R., Bradley, I.V., Phillips, J. and Murdin, B.N. (2004) Far Infrared Modulated Photoluminescence in InSb Quantum Dots. Physica E: Low-dimensional Systems and Nanostructures 22(1-3): 59-602. http://dx.doi.org/10.1016/j.physe.2003.12.079. (Journal Article)
  • Child, R.A., Nicholas, R.J., Mason, N.J., Shields, P.A., Wells, J.-P.R., Bradley, I.V., Phillips, J. and Murdin, B.N. (2004) Far Infrared Modulated Photoluminescence Spectroscopy of InSb/GaSb Quantum Dot Structures. Physical Review B 68(16): 165307-165311. http://dx.doi.org/10.1103/PhysRevB.68.165307. (Journal Article)
  • Fan, W.H., Olaizola, S.M., Wells, J.-P.R., Fox, A.M., Wang, T., Parbrook, P.J., Mowbray, D.J. and Skolnick, M.S. (2004) Femtosecond Studies of Carrier Capture in InGaN/GaN Multiple Quantum. Applied Physics Letters 84(16): 3052-3054. http://dx.doi.org/10.1063/1.1707226. (Journal Article)
  • Wells, J-P.R., Jones, G.D., Carder, D.A. and Phillips, P.J. (2004) Free electron laser studies of local mode linewidths in SrF2:Gd3+:H-. Physica status solidi (c) 1(11): 3011-3014. (Journal Article)
  • Halsall, M.P., Dunbar, A.D.F., Shiraki, Y., Miura, M. and Wells, J.-P.R. (2004) Hole confinement and dynamics in δ-doped Ge quantum dots. Journal of Luminescence 108(1-4): 329-332. http://dx.doi.org/10.1016/j.jlumin.2004.01.069. (Journal Article)
  • Wells, J.-P.R., Jones, G.D., Reid, M.F., Popova, M.N. and Chukalina, E. (2004) Hyperfine patterns of infrared absorption lines of Ho3+ C4v centres in CaF2. Molecular Physics 102(11-12): 1367-1376. http://dx.doi.org/10.1080/00268970410001728555. (Journal Article)
  • Zibik, E.A., Wilson, L.R., Green, R.P., Bastard, G., Ferreira, R., Phillips, P.J., Carder, D.A., Wells, J-P.R., Cockburn, J.W., Skolnick, M.S., Steer, M.J. and Hopkinson, M. (2004) Intraband relaxation via polaron decay in InAs self-assembled quantum dots. Physical Review B - Condensed Matter and Materials Physics 70(16): 161305, 1-4. http://dx.doi.org/10.1103/PhysRevB.70.161305. (Journal Article)
  • Yamaga, M., Wells, J.-P.R., Honda, N., Han T.P.J., Henderson. and B. (2004) Investigation on the valence of Cr ions in LiAlO2. Journal of Luminescence 108(1-4): 313-317. http://dx.doi.org/10.1016/j.jlumin.2004.01.066. (Journal Article)
  • Yamaga, M., Yabashi, S., Masui, Y., Honda, N., Sarukura, N., Wells, J.-P.R. and Jones, G.D. (2004) Optical, infrared and EPR spectroscopy of CaF2:Ce3+ crystals co-doped with Li+ or Na+. Journal of Luminescence 108(1-4): 307-311. http://dx.doi.org/10.1016/j.jlumin.2004.01.065. (Journal Article)
  • Zibik, E.A., Wilson, L.R., Green, R.P., Bastard, G., Ferreira, R., Wells, J-P.R., Phillips, P.J., Carder, D.A., Cockburn, J.W., Skolnick, M.S., Steer, M.J. and Hopkinson, M. (2004) Polaron decay and inter-level transfer in InAs/GaAs self-assembled quantum dots. Physica status solidi (c) 1(11): 2613-2616. (Journal Article)
  • Zibik, E.A., Wilson, L.R., Green, R.P., Wells, J.-P.R., Phillips, P.J., Carder, D.A., Cockburn, J.W., Skolnick, M.S., Steer, M.J., Liu, H.Y. and Hopkinson, M. (2004) Polaron Relaxation Channel in InAs/GaAs Self Assembled Dots. Semiconductor Science and Technology 19(4): S316-S318. http://dx.doi.org/10.1088/0268-1242/19/4/105. (Journal Article)
  • Zibik, E.A., Wilson, L.R., Green, R.P., Wells, J.-P.R., Phillips, P.J., Carder, D.A., Cockburn, J.W., Skolnick, M.S., Steer, M.J., Liu, H.Y. and Hopkinson, M. (2004) Polaron Relaxation Dynamics in InAs/GaAs Self Assembled Dots. Physica E Low-dimensional Systems and Nanostructures 21(2-4): 405-408. http://dx.doi.org/10.1016/j.physe.2003.11.065. (Journal Article)
  • Tartakovski, A.I., Makhonin, M.N., Steer, M.J., Groom, K.M., Cahill, J., Whittaker, D.M., Wells, J-P.R., Fox, A.M., Skolnick, M.S. and Hopkinson, M. (2004) Precise Measurement of the Fraction of Charged Dots in Self Assembled Quantum Dot Ensembles Using Ultrafast Pump-Probe Techniques. Applied Physics Letters 85(12): 2226-2229. http://dx.doi.org/10.1063/1.1796524. (Journal Article)
  • Munyeme, G., Wells, J.-P.R., van der Meer, L.F.G., Dijkhuis, J.I., van der Weg, W.F. and Schropp. R.E.I. (2004) Stability of Deuterated Amorphous Silicon Solar Cells. Journal of Non-Crystalline Solids 338-340: 291-294. http://dx.doi.org/10.1016/j.jnoncrysol.2004.02.089. (Journal Article)
  • Wells, J-P.R., Lidzey, D.G., Phillips, P.J., Carder, D.A. and Fox, A.M. (2004) Ultrafast measurements of vibrational relaxation in the conjugated polymer poly(9,9-dioctylfluorene). Applied Physics Letters 85(15): 3080-3082. (Journal Article)
  • Bristow, A.D., Kundys, D.O., Garcia-Deniz, A.Z., Wells, J.-P.R., Fox, A.M., Skolnick, M.S., Whittaker, D.M., Tahraoui, A., T.F. Krauss. and Roberts, J.S. (2004) Ultrafast nonlinear tuning of the reflection properties of AlGaAs photonic crystal waveguides by two-photon Absorption. Journal of Applied Physics 96(9): 4729-4735. http://dx.doi.org/10.1063/1.1790569. (Journal Article)
  • Wells, J-P.R., van Hattum, E.D., Schropp, R.E.I., Phillips, P.J., Carder, D.A., Habraken, F.H.P.M. and Dijkhuis, J.I. (2004) Ultrafast spectroscopy of localised vibrational modes in amorphous silicon using a free electron laser. Physica status solidi (b) 241(15): 3474-3479. (Journal Article)
  • Jones, G.D. and Wells, J.-P.R. (2004) Vibrational Linewidths and Dephasing of H- Local Modes in Disordered Calcium Fluoride. Journal of Luminescence 108(1-4): 221-224. http://dx.doi.org/10.1016/j.jlumin.2004.01.047. (Journal Article)
  • Fan, W.H., Olaizola, S.M., Wang, T., Parbrook, P.J., Wells, J.-P.R., Mowbray, D.J., Skolnick, M.S. and Fox, A.M. (2003) Carrier Capture Time in InGaN/GaN Multiple Quantum Wells. physica status solidi (b) 240(2): 364-367. http://dx.doi.org/10.1002/pssb.200303389. (Journal Article)
  • Zheng, W.M., Halsall, M.P., Harrison, P., Wells, J.-P.R., Bradley, I.V. and Steer, M.J. (2003) Effect of Quantum-Well Confinement on Acceptor State Lifetime in Delta-Doped GaAs/AlAs Multiple Quantum Wells. Applied Physics Letters 83(18): 3719. (Journal Article)
  • Wells, J-P.R., Yamaga, M., Han, T.P.J. and Honda, M. (2003) Electron Paramagnetic Resonance and Optical Properties of Cr3+ Doped YAl3(BO3)4. Journal of Physics: Condensed Matter 15(3): 539-547. (Journal Article)
  • Murzyn, P., Pidgeon, C.R., Phillips, P.J., Wells, J-P.R., Gordon, N.T., Ashley, T., Jefferson, J.H., Burke, T.M. and Giess, J. (2003) Electron Spin Lifetimes in Long-Wavelength Hg1-xCdxTe and InSb at Elevated Temperature. Physical Review B: Condensed Matter and Materials Physics 67(23): 235202 (5pp). http://dx.doi.org/10.1103/PhysRevB.67.235202. (Journal Article)
  • Wells, J-P.R., Phillips, P.J., Tomozeiu, N., Habraken, F.H.P.M. and Dijkhuis, J.I. (2003) Infrared Transient Grating and Photon Echo Spectroscopy of Oxygen Vibrational Modes in Amorphous Silicon Thin Films. Physical Review B: Condensed Matter and Materials Physics 68(11): 115207 (5pp). http://dx.doi.org/10.1103/PhysRevB.68.115207. (Journal Article)
  • Forcales, M., Gregorkiewicz, T., Bresler, M.S., Gusev, O.B., Bradley, I.V. and Wells, J.-P.R. (2003) Microscopic model for nonexcitonic mechanism of 1.5-μm photoluminescence of the Er3+ ion in crystalline Si. Physical Review B 67(8): 085303-085313. http://dx.doi.org/10.1103/PhysRevB.67.085303. (Journal Article)
  • Wojak, M., Klik, M.A.J., Forcales, M., Gregorkiewicz, T., Wells, J.-P.R., Pakula, K., Baranowski, J.M. and Porowski, S. (2003) Photoluminescence of GaN Layers Studied With Two-Colour Spectroscopy. Solid-State Electronics 47(3): 579-581. http://dx.doi.org/10.1016/S0038-1101(02)00417-3. (Journal Article)
  • Halsall, M.P., Harmer, P., Parbrook, P.J., Wang, T. and Wells, J.-P.R. (2003) Photoluminescence of Single InGaN Quantum Dots Grown at Low Surface Densities by MOPVE. physica status solidi (a) (a) 195: 3. (Journal Article)
  • Jones, G.D. and Wells, J.-P.R. (2003) Picosecond Lifetimes and Infrared Spectroscopy of Hydrogenic Sites in KY3F10 and LiYF4. Journal of Luminescence 102-103(169): 169-172. http://dx.doi.org/10.1016/S0022-2313(02)00484-2. (Journal Article)
  • Zheng, W-M., Halsall, M.P., Harrison, P., Wells, J-P.R., Bradley, I.V. and Steer, M.J. (2003) Picosecond Time-Resolved Studies of Excited State Lifetimes of Be Acceptors in GaAs/AlAs Multiple Quantum Wells. physica status solidi (b) 235(1): 54-57. http://dx.doi.org/10.1002/pssb.200301527. (Journal Article)
  • Paul, D.J., Lynch, S.A., Bates, R., Ikonic, Z., Kelsall, R.W., Harrison, P., Norris, D.J., Liew, S.L., Cullis, A.G., Arnone, D.D., Pidgeon, C.R., Murzyn, P., Wells, J.-P.R. and Bradley, I.V. (2003) Si/SiGe Quantum-Cascade Emitters for Terahertz Applications. Physica E Low-dimensional Systems and Nanostructures 16(1): 147-155. http://dx.doi.org/10.1016/S1386-9477(02)00590-8. (Journal Article)
  • Pidgeon, C.R., Murzyn, P., Wells, J.-P.R., Ikonic, Z., Kelsall, R.W., Harrison, P., Lynch, S.A., Paul, D.J., Arnone, D.D. and Robbins, D.J. (2003) THz Intersubband Dynamics in p-Si/SiGe Quantum Well Emitter Structures. physica status solidi (b) 237(1): 381-385. http://dx.doi.org/10.1002/pssb.200301784. (Journal Article)
  • Forcales, M., Kilk, M.A.J., Vinh, N.Q., Phillips, J., Wells, J.-P.R. and Gregorkiewicz, T. (2003) Two-Colour Mid-Infrared Spectroscopy of Optically Doped Semiconductors. Journal of Luminescence 102-103: 85-90. http://dx.doi.org/10.1016/S0022-2313(02)00498-2. (Journal Article)
  • Bristow, A.D., Wells, J-P.R., Fan, W.H., Fox, A.M., Skolnick, M.S., Whittacker, D.M., Tahraoui, A. and Krauss, T.F. (2003) Ultrafast nonlinear response of AlGaAs two-dimensional photonic crystal waveguides. Applied Physics Letters 83(5): 851-853. http://dx.doi.org/10.1063/1.1598647. (Journal Article)
  • Forcales, M., Gregorkiewicz, T., Bradley, I.V. and Wells, J.-P.R. (2002) Afterglow effect in photoluminescence of Si:Er. Physical Review B 65(19): 195208-195216. http://dx.doi.org/10.1103/PhysRevB.65.195208. (Journal Article)
  • Murdin, B.N., Adams, A.R., Murzyn, P., Pidgeon, C.R., Bradley, I.V., Wells, J-P.R., Matsuda, Y.H., Miura, N., Burke, T. and Johnson, A.D. (2002) Band Anticrossing in Dilute InNxSb1-x. Applied Physics Letters 81(2): 256-258. http://dx.doi.org/10.1063/1.1493663. (Journal Article)
  • Clarke, D.G., Pidgeon, C.R., Wells, J.-P.R., Bradley, I.V., Murray, R. and Murdin, B.N. (2002) Double Resonance Study of Hole Burning in Self Assembled Quantum Dots. Physica B Condensed Matter 314(1-4): 474-476. http://dx.doi.org/10.1016/S0921-4526(01)01413-2. (Journal Article)
  • Tan, H.A., Xin, Z-J., Rutt, H.N., Wells, J-P.R. and Bradley, I.V. (2002) Intersubband Lifetimes and Free Carrier Effects in Optically Pumped Far Infrared Quantum Wells Laser Structures. Semiconductor Science and Technology 17: 645-650. http://dx.doi.org/10.1088/0268-1242/17/7/301. (Journal Article)
  • Klik, M.A.J., Gregorkiewicz, T., Bradley, I.V. and Wells, J-P.R. (2002) Optically Induced Deexcitation of Rare-Earth Ions in a Semiconductor Matrix. Physical Review Letters 89(22): 227401 (4pp). (Journal Article)
  • Murzyn, P., Pidgeon, C.R., Wells, J.-P.R., Bradley, I.V., Ikonic, Z., Kelsall, R.W., Harrison, P., Lynch, S.A., Paul, D.J., Arnone, D.D., Robbins, D.J., Norris, D. and Cullis, A.G. (2002) Picosecond Intersubband Dynamics in p-Si/SiGe Quantum Well Emitter Structures. Applied Physics Letters 80(8): 1456-1458. http://dx.doi.org/10.1063/1.1452794. (Journal Article)
  • Jones, G.D. and Wells, J-P.R. (2002) Picosecond lifetimes and infrared spectroscopy of hydrogenic sites in KY3F10 and LiYF4. Budapest, Hungary: Proceedings of the 2002 International Conference on Luminescence and Optical Spectroscopy of Condensed Matter, 24-29 Aug 2002. In Journal of Luminescence 102-103 169-172. http://dx.doi.org/10.1016/S0022-2313(02)00484-2. (Conference Contribution - Paper in published proceedings)
  • Yamaga, M., Inoue, T., Yabasi, S., Honda, M., Wells, J-P.R., Shimamura, K. and Fukuda, T. (2002) Site Symmetry and Crystal Field Splittings of Ce3+ in LiLuF4 and LiSr0.8Ca0.2AlF6. Radiation Effects and Defects in Solids 157(6-12): 977-982. http://dx.doi.org/10.1080/10420150215760. (Journal Article)
  • Yamaga, M., Honda, M., Kawamata, N., Samejima, K. and Wells, J.-P.R. (2002) The Role of Li+ and Na+ Charge Compensators in Sm3+ doped CaF2 and SrF2. EPR in the 21st Century: Basics and Applications to Materials, Life and Earth Sciences : 201. (Journal Article)
  • Pidgeon, C.R., Murzyn, P., Wells, J-P.R., Bradley, I.V., Ikonic, Z., Kelsall, R.W., Harrison, P., Lynch, S.A., Paul, D.J., Arnone, D.D., Robbins, D.J., Norris, D. and Cullis, A.G. (2002) THz Intersubband Dynamics in p-Si/SiGe Quantum Well Structures. Physica E: Low-dimensional Systems and Nanostructures 13(2-4): 904-907. http://dx.doi.org/10.1016/S1386-9477(02)00231-X. (Journal Article)
  • Wells, J-P.R., Schropp, R.E.I., van der Meer, L.F.G. and Dijkhuis, J.I. (2002) Ultrafast Vibrational Dynamics and Stability of Deuterated Amorphous Silicon. Physical Review Letters 89(12): 125504-125507. http://dx.doi.org/10.1103/PhysRevLett.89.125504. (Journal Article)
  • Murdin, B.N., Kamal-Saadi, M., Lindsay, A., O'Reilly, E.P., Adams, A.R., Nott, G.J., Crowder, J.G., Pidgeon, C.R., Bradley, I.V., Wells, J-P.R., Burke, T., Johnson, A.D. and Ashley, T. (2001) Auger Recombination in Long-Wavelength Infrared InNxSb1-x Alloys. Applied Physics Letters 78(11): 1568-1570. http://dx.doi.org/10.1063/1.1355301. (Journal Article)
  • Wang, G., Lin, Z., Hu, Z., Han, T.P.J., Gallagher, H.G. and Wells, J.-P.R. (2001) Crystal Growth and Optical Assessment of Nd3+:GdAl3(BO3)4 Crystal. Journal of Crystal Growth 233(4): 755-760. http://dx.doi.org/10.1016/S0022-0248(01)01613-X. (Journal Article)
  • Forcales, M., Kilk, M., Vinh, N.Q., Bradley, I.V., Wells, J.-P.R. and Gregorkiewicz. T. (2001) Free-Electron Laser Studies of Energy Transfer Mechanisms in Semiconductors Doped With Transition Series Ions. Journal of Luminescence 94-95: 243-248. http://dx.doi.org/10.1016/S0022-2313(01)00287-3. (Journal Article)
  • Wells, J-P.R., Bradley, I.V., Jones, G.D. and Pidgeon, C.R. (2001) Free-electron-laser studies of the relaxation of H- and D- local modes in CaF2, SrF2, and BaF2. Physical Review B: Condensed Matter 64(14): 144303 (7pp). http://dx.doi.org/10.1103/PhysRevB.64.144303. (Journal Article)
  • Jones, G.D., Sung, J.Y., Hulme, T., Ing, L.S., Bradley, I.V. and Wells, J.-P.R. (2001) Infrared Absorption of H- and D- in the Alkaline-Earth Fluorides. Journal of Physics: Condensed Matter 13: 2127-2135. http://dx.doi.org/10.1088/0953-8984/13/10/307. (Journal Article)
  • Forcales, M., Bradley, I.V., Wells, J.-P.R. and Gregorkiewicz, T. (2001) Mid-infrared induced quenching of photoluminescence in Si:Er. Materials Science and Engineering B 81(1-3): 80-82. http://dx.doi.org/10.1016/S0921-5107(00)00741-8. (Journal Article)
  • Bradley, I.V., Murzyn, P., Murdin, B.N., Wells, J.-P.R., Clarke, D.G., Stradling, R.A. and Pidgeon, C.R. (2001) Multi phonon emission in InAs quantum wells studied with a free electron laser and high pulsed magnetic fields. Journal of Luminescence 94-95: 707-711. http://dx.doi.org/10.1016/S0022-2313(01)00354-4. (Journal Article)
  • Klik, M.A.J., Bradley, I.V., Wells, J.-P.R. and Gregorkiewicz, T. (2001) Optically Induced Auger Recombination of Yb3+ in P-Type InP. Physica B Condensed Matter 308-310: 884-887. http://dx.doi.org/10.1016/S0921-4526(01)00946-2. (Journal Article)
  • Halsall, M.P., Harrison, P., Wells, J-P.R., Bradley, I.V. and Pellemans, H. (2001) Picosecond Far-Infrared Studies of Intra-Acceptor Dynamics in Bulk GaAs and Delta-Doped AlAs/GaAs Quantum Wells. Physical Review B 63(15): 155314 (5pp). http://dx.doi.org/10.1103/PhysRevB.63.155314. (Journal Article)
  • Wells, J.-P.R. and Reeves, R.J. (2001) Polarized Laser Selective Excitation and Zeeman Infrared Absorption of C4v and C3v Symmetry Centers in Eu3+ Doped CaF2, SrF2 and BaF2. Physical Review B 64(3): 5102-5111. http://dx.doi.org/10.1103/PhysRevB.64.035102. (Journal Article)
  • Wells, J-P.R., Bradley, I.V., Jones, G.D. and Pidgeon, C.R. (2001) Population Dynamics of H- Local Modes in CaF2:Lu3+ Crystals Studied Using a Free-electron Llaser. Journal of Physics: Condensed Matter 13: 2137-2145. http://dx.doi.org/10.1088/0953-8984/13/10/308. (Journal Article)
  • Forcales, M., Bradley, I.V., Wells, J.-P.R. and Gregorkiewicz, T. (2001) Time Resolved Investigation of the Mid-Infrared-Induced Enhancement of Er3+ in Si. Physica B Condensed Matter 308-310: 337-339. http://dx.doi.org/10.1016/S0921-4526(01)00692-5. (Journal Article)
  • Wells, J-P.R., Sugiyama, A., Han, T.P.J. and Gallagher, H.G. (2000) A Spectroscopic Comparison of Samarium-Doped LiYF4 and KY3F10. Journal of Luminescence 87-89: 1029-1031. http://dx.doi.org/10.1016/S0022-2313(99)00519-0. (Journal Article)
  • Yamaga, M., Honda, M., Wells, J.-P.R., Han, T.P.J. and Gallagher, H.J. (2000) An electron paramagnetic resonance study on Sm3+ and Yb3+ in KY3F10 crystals. Journal of Physics: Condensed Matter 12(40): 8727-8736. http://dx.doi.org/10.1088/0953-8984/12/40/314. (Journal Article)
  • Wells, J-P.R., Rella, C.W., Bradley, I.V., Galbraith, I. and Pidgeon, C.R. (2000) Coherent Dynamics of the Localized Vibrational Modes of Hydrogen in CaF2. Physical Review Letters 84(21): 4998-5001. (Journal Article)
  • Wells, J-P.R., Gallagher, H.G. and Han, T.P.J. (2000) Crystal Growth and Spectroscopy of Er3+ Ions in Calcium Gallogermanate. Journal of Crystal Growth 217(3): 302-310. http://dx.doi.org/10.1016/S0022-0248(00)00485-1. (Journal Article)
  • Nott, G.J., Findlay, P.C., Crowder, J.G., Pidgeon, C.R., Elliot, C.T., Ashley, T., Johnson, A.D., Wells, J-P.R., Bradley, I.V., Murdin, B.N. and White, A.M. (2000) Direct Determination of Shockley-Read-Hall Trap Density in InSb/InAlSb Detectors. Journal of Physics: Condensed Matter 12: L731-L734. http://dx.doi.org/10.1088/0953-8984/12/50/101. (Journal Article)
  • Wells, J-P.R., Han, T.P.J., Yamaga, M., Kodama, N. and Gallagher, H.G. (2000) Disordered Laser Gain Media: Er3+ Doped CaGdAlO4 and Ca3Ga2Ge4O14. Journal of Luminescence 87-89: 1093-1095. http://dx.doi.org/10.1016/S0022-2313(99)00552-9. (Journal Article)
  • Murdin, B.N., Hollingworth, A.R., Barker, J.A., Findlay, P.C., Clarke, D., Pidgeon, C.R., Wells, J.-P.R., Bradley, I.V., Malik, S. and Murray, R. (2000) Double-resonance spectroscopy of InAs/GaAs self-assembled quantum dots. Physical Review B 62(12): R7755-R7758. http://dx.doi.org/10.1103/PhysRevB.62.R7755. (Journal Article)
  • Wells, J.-P.R., Yamaga, M., Han, T.P.J. and Gallagher, H.G. (2000) Infrared Absorption, Laser Excitation and Crystal-Field Analyses of the C4v Symmetry Center in KY3F10 Doped With Pr3+. Journal of Physics: Condensed Matter 12(24): 5297-5306. http://dx.doi.org/10.1088/0953-8984/12/24/318. (Journal Article)
  • Wells, J.-P.R., Yamaga, M., Mosses, R.W., Han, T.P.J., Gallagher, H.G. and Yosida, T. (2000) Polarized laser selective excitation and electron paramagnetic resonance of Er3+ centers in SrLaAlO4 crystals. Physical Review B 61(6): 3905-3914. http://dx.doi.org/10.1103/PhysRevB.61.3905. (Journal Article)
  • Wells, J-P.R. and Reeves, R.J. (2000) Polarized Laser-Selective Excitation and Zeeman Infrared Absorption of Sm3+ Centers in CaF2 and SrF2 Crystals. Physical Review B 61(20): 13593-13608. http://dx.doi.org/10.1103/PhysRevB.61.13593. (Journal Article)
  • Findlay, P.C., Wells, J.-P.R., Bradley, I.V., Pidgeon, C.R., Murdin, B.N., Yang, M.J., Vurgaftman, I. and Meyer, J.R. (2000) Suppression of Auger Recombination in Long Wavelength Quantum Well ‘W’ Structure Lasers. Physical Review B 62(15): 10295-10300. http://dx.doi.org/10.1103/PhysRevB.62.10297. (Journal Article)
  • Wells, J.-P.R., Sugiyama, A., Han, T.P.J. and Gallagher, H.G. (1999) Laser site selective excitation of KY3F10 doped with samarium. Journal of Luminescence 85(1-3): 91-102. http://dx.doi.org/10.1016/S0022-2313(99)00150-7. (Journal Article)
  • Wells, J.-P.R., Yamaga, M., Han., T.P.J. and Mosses., R.W. (1999) Optical and EPR studies of the Er3+ ion site distribution in SrLaAlO4:Er3+ crystals. Radiation Effects and Defects in Solids 149(1-4): 341-345. http://dx.doi.org/10.1080/10420159908230178. (Journal Article)
  • Wells, J.-P.R., Yamaga, M., Han, T.P.J., Gallagher, H.G. and Honda, M. (1999) Polarized laser excitation and electron paramagnetic resonance of Sm3+ doped LiYF4. Physical Review B 60(6): 3849-3855. http://dx.doi.org/10.1103/PhysRevB.60.3849. (Journal Article)
  • Wells, J.-P.R., Yamaga, M., Kodama, N. and Han, T.P.J. (1999) Polarized laser spectroscopy and crystal-field analysis of Er3+ doped CaGdAlO4. Journal of Physics: Condensed Matter 11(39): 7545-7555. http://dx.doi.org/10.1088/0953-8984/11/39/310. (Journal Article)
  • Wells, J.-P.R., Han., T.P.J. and McConnell., G. (1999) Upconversion spectroscopy of Ca3Ga2Ge4O14 doped with trivalent erbium. Radiation effects and defects in solids 149(1-4): 329-333. http://dx.doi.org/10.1080/10420159908230176. (Journal Article)
  • Wells, J.-P.R., Jones, G.D. and Reeves, R.J. (1999) Zeeman and hyperfine infrared-spectra of Pr3+ centres in alkaline earth fluoride crystals. Physical Review B 60(2): 851-859. http://dx.doi.org/10.1103/PhysRevB.60.851. (Journal Article)
  • Mosses, R.W., Wells, J.-P.R., Gallagher, H.G., Han, T.P.J., Yamaga, M., Kodama, N. and Yosida, T. (1998) Czochralski growth and IR-to-visible upconversion of Ho3+ and Er3+ doped SrLaAlO4. Chemical Physics Letters 286(3-4): 291-297. http://dx.doi.org/10.1016/S0009-2614(98)00107-9. (Journal Article)
  • Wells, J.-P.R., Heron, R.J., Jones, G.D., Manson, N.B. and Martin, J.P.D. (1998) Selective laser excitation and ODNMR studies of SrF2: Pr3+ codoped with La3+. Journal of Luminescence 78(3): 213-219. http://dx.doi.org/10.1016/S0022-2313(97)00312-8. (Journal Article)