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Plasmonics, a technique to tightly concentrate light down to the nanoscaleby coupling photons to surface plasmons,has been employed to downscalelasersto sub-wavelength dimensions. The resultant device is called a spaser, short for surface plasmon amplification by stimulated emission of radiation, or more generally plasmonic nanolaser, which is being explored for applicationsin areas such as sensing...
We developed an accurate three dimensional time domain model of a 4-level gain system fitted to lasing experiment with a silver nanohole array. The simulated emission intensity showed clear lasing effects confirmed by optical experiments.
We use titanium nitride (TiN) to demonstrate an ultra-thin plasmonic thermal emitter operating at high temperatures (830 K). The spectrally selective emitter exhibits a large emittance at around 2.5 µm and below, and suppresses emission at longer wavelengths.
We have theoretically investigated a metasurface as a unidirectional surface plasmon polariton (SPP) coupler. The structure can work over a broad bandwidth in the visible region.
We demonstrate directional plasmonic nanolaser emission using subwavelength hole arrays perforated in metal film as plasmonic nanocavities. The lasing exhibits a single mode in the red wavelength region.
When heavily doped, semiconductors such as ZnO can exhibit metallic properties thus becoming versatile building blocks for optical metamaterials. Here, we design and fabricate an all-semiconductor metamaterial and demonstrate negative refraction in the near-infrared region.
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