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학술지 Switching Terahertz Waves with Gate-Controlled Active Graphene Metamaterials
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이승훈, 최무한, 김튼튼, 이승우, Ming Liu, Xiaobo Yin, 최홍규, 이승섭, 최춘기, 최성율, Xiang Zhang, 민범기
Nature Materials, v.11 no.11, pp.936-941
Nature Publishing Group,
The extraordinary electronic properties of graphene provided the main thrusts for the rapid advance of graphene electronics. In photonics, the gate-controllable electronic properties of graphene provide a route to efficiently manipulate the interaction of photons with graphene, which has recently sparked keen interest in graphene plasmonics. However, the electro-optic tuning capability of unpatterned graphene alone is still not strong enough for practical optoelectronic applications owing to its non-resonant Drude-like behaviour. Here, we demonstrate that substantial gate-induced persistent switching and linear modulation of terahertz waves can be achieved in a two-dimensional metamaterial, into which an atomically thin, gated two-dimensional graphene layer is integrated. The gate-controllable light-matter interaction in the graphene layer can be greatly enhanced by the strong resonances of the metamaterial. Although the thickness of the embedded single-layer graphene is more than six orders of magnitude smaller than the wavelength (<{\\lambda}/1,000,000), the one-atom-thick layer, in conjunction with the metamaterial, can modulate both the amplitude of the transmitted wave by up to 47% and its phase by 32.2째 at room temperature. More interestingly, the gate-controlled active graphene metamaterials show hysteretic behaviour in the transmission of terahertz waves, which is indicative of persistent photonic memory effects. © 2012 Macmillan Publishers Limited. All rights reserved.
KSP 제안 키워드
Electro-optic tuning, Electronic properties, Electronic properties of graphene, Gate-controlled, Graphene layer, Graphene plasmonics, Hysteretic behaviour, Linear modulation, Memory effect, Optoelectronic applications, Orders of magnitude