Current-controlled light scattering and asymmetric plasmon propagation in graphene

Abstract

We demonstrate that plasmons in graphene can be manipulated using a DC current. A sourcedrain current lifts the forward/backward degeneracy of the plasmons, creating two modes with different propagation properties parallel and antiparallel to the current. We show that the propagation length of the plasmon propagating parallel to the drift current is enhanced, while the propagation length for the antiparallel plasmon is suppressed. We also investigate the scattering of light off graphene due to the plasmons in a periodic dielectric environment and we find that the plasmon resonance separates in two peaks corresponding to the forward and backward plasmon modes. The narrower linewidth of the forward propagating plasmon may be of interest for refractive index sensing and the DC current control could be used for the modulation of mid-infrared electromagnetic radiation.

Recent Progress in Active Optical Metasurfaces

“…Recently, theoretical studies have predicted that graphene nanogratings can be used to achieve well‐controlled phase of light waves for a broadband lensing effect and gate‐voltage tunable perfect absorption . A theoretical study has revealed that the interaction between graphene‐supported plasmons and direct current (DC) current flow in a system provides a novel mechanism for graphene‐based light manipulation . By engineering the intrinsic carrier transport asymmetry and the lifetime of a graphene layer as well as the depletion region of silicon, Chang et al recently have demonstrated a graphene–silicon Schottky junction based photodector with a photoresponsitivity as high as 70 A W −1 .…”

Electro-optics of current-carrying graphene

“…Rewriting the final result in terms of drift velocity leads us to the expressions presented by Eqs. (11)(12)(13)(14). The real part of the intraband optical conductivity given by Eq.…”

Боковой Перенос Энергии При Возбуждении Плазмонов Терагерцовой Волной В Периодической Пространственно Несимметричной Графеновой Структуре

“…Для возбуждения бегущих плазменных волн в графене используются дифракция электромагнитной волны на одиночных объектах, таких как: 1) острие сканирующего ближнеполевого микроскопа [9], одиночный металлический затвор, расположенный над графеном [10], щель в металлическом экране, расположенном над графеном [11]. Еще одним способом возбуждения бегущего плазмона является использование постоянного дрейфа в графене в периодических структурах [12]. Наконец следует упомянуть способы возбуждения бегущего плазмона в графене с помощью эффекта нарушенного полного внутреннего отражения с использование призм [13,14].…”