Journal
NANO LETTERS
Volume 14, Issue 5, Pages 2896-2901Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl500943r
Keywords
graphene plasmons; surface polaritons; plasmon compression; mode coupling
Categories
Funding
- ERC [258461]
- EC [CNECTICT- 604391]
- Spanish Ministry of Economy and Competitiveness [MAT2011-28581-C02, MAT2012-36580]
- European Research Council (ERC) [258461] Funding Source: European Research Council (ERC)
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Graphene plasmons promise exciting nano-photonic and optoelectronic applications. Owing to their extremely short wavelengths, however, the efficient coupling of photons to propagating graphene plasmons-critical for the development of future devices-can be challenging. Here, we propose and numerically demonstrate coupling between infrared photons and graphene plasmons by the compression of surface polaritons on tapered bulk slabs of both polar and doped semiconductor materials. Propagation of surface phonon polaritons (in SiC) and surface plasmon polaritons (in n-GaAs) along the tapered slabs compresses the polariton wavelengths from several micrometers to around 200 nm, which perfectly matches the wavelengths of graphene plasmons. The proposed coupling device allows for a 25% conversion of the incident energy into graphene plasmons and, therefore, could become an efficient route toward graphene plasmon circuitry.
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