Broadband Tunable THz Absorption with Singular Graphene Metasurfaces
arXiv:1810.10467 · doi:10.1021/acsnano.7b07951
Abstract
By exploiting singular spatial modulations of the graphene conductivity, we design a broadband, tunable THz absorber whose efficiency approaches the theoretical upper bound for a wide absorption band with a fractional bandwidth of 185\%. Strong field enhancement is exhibited by the modes of this extended structure, which is able to excite a wealth of high order surface plasmons, enabling deeply subwavelength focussing of incident THz radiation. Previous studies have shown that the conductivity can be modulated at GHz frequencies, which might lead to the development of efficient high speed broadband switching by an atomically thin layer.
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Cited by in corpus (7)
- A transformation optics approach to singular metasurfaces
- Nonlocal effects in singular plasmonic metasurfaces
- Non-local quantum effects in plasmons of graphene superlattices
- Probing Graphene's Nonlocality with Singular Metasurfaces
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- High-order multipoles in all-dielectric metagrating enabling ultralarge-angle light bending with unity efficiency