Broadband Tunable THz Absorption with Singular Graphene Metasurfaces
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 ext...
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| Veröffentlicht in: | arXiv.org 2018-10 |
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| creator | Galiffi, Emanuele Pendry, John Paloma Arroyo Huidobro |
| description | 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. |
| doi_str_mv | 10.48550/arxiv.1810.10467 |
| format | Article |
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| subjects | Absorption spectra Bandwidths Broadband Graphene Metasurfaces Physics - Mesoscale and Nanoscale Physics Plasmons Upper bounds |
| title | Broadband Tunable THz Absorption with Singular Graphene Metasurfaces |
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