Angle- and position-insensitive electrically tunable absorption in graphene by epsilon-near-zero effect

Optics Express
Sangjun LeeSangin Kim

Abstract

We propose an electrically tunable absorber based on epsilon-near-zero (ENZ) effect of graphene embedded in a nanocavity, which is composed of metal grating and substrate. Due to strong surface-normal electric field confined in ENZ graphene in the proposed structure, greatly enhanced light absorption (~80%) is achieved in an ultrathin graphene monolayer. By electrically controlling the Fermi-level of graphene, a sharp peak absorption wavelength is tuned over a wide range. The proposed device can work as an optical modulator or a tunable absorption filter, which has a unique feature of incident angle insensitiveness owing to the ENZ effect and magnetic dipole resonance. Moreover, existence of a significantly dominant electric field and its uniformity make the device performance independent of the position of the graphene layer in the nanocavity, which provides great fabrication tolerance.

References

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Jul 20, 2011·Nano Letters·Frank H L KoppensF Javier García de Abajo
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Mar 19, 2014·Nature Nanotechnology·Chang-Hua LiuZhaohui Zhong

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