Nonlocal response of hyperbolic metasurfaces

Nonlocal response of hyperbolic metasurfaces

We analyze and model the nonlocal response of ultrathin hyperbolic metasurfaces (HMTSs) by applying an effective medium approach. We show that the intrinsic spatial dispersion in the materials employed to realize the metasurfaces imposes a wavenumber cutoff on the hyperbolic isofrequency contour, in...

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Veröffentlicht in:Optics express 2015-11, Vol.23 (23), p.29434-29448
Hauptverfasser: Correas-Serrano, D, Gomez-Diaz, J S, Tymchenko, M, Alù, A
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container_title Optics express
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creator Correas-Serrano, D
Gomez-Diaz, J S
Tymchenko, M
Alù, A
description We analyze and model the nonlocal response of ultrathin hyperbolic metasurfaces (HMTSs) by applying an effective medium approach. We show that the intrinsic spatial dispersion in the materials employed to realize the metasurfaces imposes a wavenumber cutoff on the hyperbolic isofrequency contour, inversely proportional to the Fermi velocity, and we compare it with the cutoff arising from the structure granularity. In the particular case of HTMSs implemented by an array of graphene nanostrips, we find that graphene nonlocality can become the dominant mechanism that closes the hyperbolic contour - imposing a wavenumber cutoff at around 300k(0) - in realistic configurations with periodicity L
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In addition, we investigate how spatial dispersion affects the spontaneous emission rate of emitters located close to HMTSs. 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