Nonlinear plasmonic devices and ultrabroadband light concentrators/absorbers
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Nonlinear plasmonic devices and ultrabroadband light concentrators/absorbers
Fri, 08/02/2013 - 14:15 to 15:15
Location:
Speaker:
Dr Christos Argyropoulos
Affiliation:
University of Texas at Austin
Synopsis:
In this talk, we will analyze the effects of optical nonlinearities in plasmonic nanoparticles and gratings at optical frequencies. The large field enhancement in the vicinity of individual and collections of plasmonic nanoparticles and inside metamaterial gratings ensures a significant boosting of nonlinear optical effects, which may be exploited in several exciting applications. These results can potentially lead to broadband subwavelength resolution lenses, novel plasmonic nanocircuit components, tunable optical sensors, all-optical switches and memories. In the second part of this talk, we will discuss the recent theoretical and experimental advancements towards demonstrating the potentials of plasmonic nanoparticle arrays or metamaterial gratings to increase the concentration of energy and overall absorption in energy harvesting devices. The plasmonic Brewster angle metasurface concept will be presented, which allows anomalous ultrabroadband tunneling of the entire impinging energy inside very small apertures, overcoming the bandwidth limitations of resonant arrays or apertures commonly used for transmission enhancement and energy concentration, based mostly on the narrowband Purcell effect and Fabry-Perot resonances.
Biography:
Christos Argyropoulos received the Diploma of Electrical and Computer Engineering from the Aristotle University of Thessaloniki, Greece (2006). He holds a M.Sc. degree in Communication Engineering from the Microwaves and Communication Systems group of the University of Manchester, UK (2007) and a Ph.D. degree in Electronic Engineering from the Antennas and Electromagnetics Group of the Queen Mary, University of London, UK (2010). Dr Argyropoulos is currently a Postdoctoral Fellow at Metamaterials and Plasmonics Research Group in the Department of Electrical and Computer Engineering, University of Texas at Austin, USA.
He has published over 70 technical papers in highly ranked journals and refereed conference proceedings, including 3 book chapters. He has received several travel and research awards, such as EPSRC Research Scholarship, Royal Academy of Engineering international travel grant and twice the Marie Curie Actions Grant.