Nanophotonics and Metrology laboratory NAM

Latest news

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  Double resonant antenna to enhance SHG

  Second harmonic generation (SHG) is an optical process where a system illuminated at a fundamental frequency produces a response at twice that fundamental frequency (the second harmonic). Recently we proposed an original nano-antenna structure to enhance this process using double resonances both at the fundamental and the second harmonic frequency.
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  Anisotropic Purcell factor

  There are many on-going experiments that deal with the interaction of molecules or atoms with plasmonic systems. Unfortunately, the theoretical description of these experiments is often limited to simplistic two-level atoms. Here we introduce the more advanced anisotropic Purcell factor to describe the spontaneous emission linewidths of a four-level atom. This original approach provides a very good description of the interaction between molecules and plasmonic nanostructures in the weak coupling regime.
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  Making the invisible visible!

  The way we apprehend our world is obviously determined by the fact that what we observe is visible or not! This is also true for observing light emitted from molecules or atoms. Whilst numerous optical transitions are possible between the different energy levels of such a molecule or atom, many of these transitions never show up since they are forbidden by symmetry rules. However, when the surrounding of the emitter (atom, molecule) is modified, these symmetry rules are modified and transitions that were previously forbidden and invisible, become perfectly visible!
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  Controllable coherent perfect absorption

  In a recent papers we have shown that the concept of coherent perfect absorption can be extended to versatile geometries using a heterogeneous metal-dielectric composite layer as absorber.
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  NAM Christmas dinner

  This year, the traditional Christmas dinner had a nice and warm feeling: we enjoyed a mouthwatering couscous, while it was a freezing cold December night outside!
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  Fano resonances: retrieving the underlying modal structure

  In plasmonic systems, Fano resonance originate from the interaction between a bright and a dark mode. Using our recently developed ab-initio formalism, we demonstrate that the underlying modal structure can be easily retrieved for a broad variety of experimental plasmonic systems.
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