Department of Electrical and Computer Engineering Seminar Series

Magnetic, chemical and electrical steering of light at the nanoscale

Speaker

Prof Alexandre Dmitriev

Institute

Erskine Visiting Fellow Department of Electrical and Computer Engineering, University of Canterbury, Christchurch. Department of Physics, University of Gothenburg, Gothenburg 412 96, Sweden

Time & Place

Fri, 08 Mar 2019 14:00:00 NZDT in Link 309 Lecture Theatre

Abstract

Optics that can be changed in real time is set to revolutionize the broadest set of technologies from the ultrafast optical data processing and storage to the augmented/mixed reality and optical ranging in selfdriving vehicles. However, what nature developed over the millions of years of evolution as a human eye, able to dynamically change the focal distance combined with fast vergence, represents a largely unresolved technological challenge. Currently available means to dynamically tune the optics are either bulky and often extremely challenging to integrate, or intrinsically slow. While the scaling down of optics is realized by nanophotonics, several approaches have been explored so far to reach the dynamic tunability, including mechanical deformation, thermal or refractive index effects, and all-optical switching. We combine the plasmonic and magnetic materials to devise various nano-optical systems that are controlled by the external magnetic field. These include chiral optics, polarizers and biological/chemical sensors. The latest advance is to control the structure of such antennas by the externally-applied electrical bias. Another consequence of developing the near-field and far-field optics, steerable at the nanoscale, is the access to the tunable (i.e., externally-controlled) photochemistry. We use cm2 arrays of optical antennas and the molecular photoswitches to explore the strong plasmon-molecular coupling and its tunability. I will discuss the various low-cost bottom-up nanofabrication methods that we develop to produce and transfer at will large surfaces with nanosized elements that can be used in nanophotovoltaics, thermal management, biophysics and other fields.

Biography

PhD in Physics 2000-2003 on the low-dimensional supramolecular systems with metal-organic coordination by the scanning tunneling microscopy / spectroscopy at Max-Planck-Institute for Solid State Research (Stuttgart, Germany) and École Polytechnique Fédérale de Lausanne (Switzerland). From mid-2004 - at Chalmers University of Technology (Gothenburg, Sweden), first as EU Marie Curie Fellow postdoc, and later as Swedish Research Council Assistant professor, currently – Full Professor at the University of Gothenburg. Visiting professor at Stanford (USA) in 2016-2017, 2018. Holder of the Swedish Foundation for Strategic Research Future Research Leader award (2010). Chair (2010-2012) of one of formerly largest European research network in plasmonics (COST Plasmonics), Fellow of the Mobility for Regional Excellence of the Västra Götaland Region. Currently- Erskine Visiting Fellow at the University of Canterbury (Christchurch).