Abstract

We propose a highly compact structure for near total light absorption in a monolayer of graphene in the visible. The structure consists of a grating slab covered with the graphene monolayer. The grating slab is separated from a metallic back reflector by a dielectric spacer. The structure supports a guided resonance in the visible. We show that such a structure enhances light–matter interactions in graphene via critical coupling by matching the external leakage rate of the guided resonance and the intrinsic loss rate in the system. We also show that, by using the dielectric spacer between the grating and the metallic mirror, near total absorption in the graphene monolayer can be achieved in the visible without the need for thick multilayer dielectric mirrors. The proposed structure could find applications in the design of efficient nanoscale visible-light photodetectors and modulators.

© 2018 Optical Society of America

Tailoring total absorption in a graphene monolayer covered subwavelength multilayer dielectric grating structure at near-infrared frequencies

Jigang Hu, Yeming Qing, Shuying Yang, Yongze Ren, Xiaohang Wu, Weiqing Gao, and Chunyan Wu
J. Opt. Soc. Am. B 34(4) 861-868 (2017)

Tunable ultra-high-efficiency light absorption of monolayer graphene using critical coupling with guided resonance

Xiaoyun Jiang, Tao Wang, Shuyuan Xiao, Xicheng Yan, and Le Cheng
Opt. Express 25(22) 27028-27036 (2017)

Absorption enhancement in monolayer graphene using Tamm plasmon polaritons

Partha Sona Maji and Ritwick Das
OSA Continuum 1(2) 392-400 (2018)

Total absorption of light in monolayer transition-metal dichalcogenides by critical coupling

Hongju Li, Meng Qin, Lingling Wang, Xiang Zhai, Rongze Ren, and Jigang Hu
Opt. Express 25(25) 31612-31621 (2017)

Enhanced near-infrared absorption in graphene with multilayer metal-dielectric-metal nanostructure

Lei Zhang, Linlong Tang, Wei Wei, Xinlu Cheng, Wei Wang, and Hong Zhang
Opt. Express 24(18) 20002-20009 (2016)