Designing plasmonic nanostructures for broadband light harvesting: the application of transformation optics in plasmonics

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• Yu Luo (Imperial College London)
• Friday 24 February 2012, 14:00-15:00
• Physics East 217.

If you have a question about this talk, please contact Vincent Boyer.

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A metallic nanoparticle of finite size usually sustains SP resonances at quantized, rather than continuous frequencies. However, this rule no longer holds true for nanostructures having a sharp edge or corner. Such geometrical features act as singularities for surface plasmons, causing them to propagate towards the sharp point, slowing down as they progress. Consequently, light energy builds up at this point and the resonance spectrum becomes continuous. In this talk, I will describe a general strategy based on transformation optics to systematically design these nanostructures. I will first discuss how to deploy the theory of transformation optics to investisgate a variety of singular plasmonic structures, and then address the question: how to realize a broadband light harvesting device with an absorption property robust to edge rounding. Finally, I will show how this approach can be applied to design some other plasmonic systems, such as the plasmonic analogue of electromagnetic induced transparency

This talk is part of the Cold Atoms series.

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