基于石墨烯的吸收体利用一维光栅中的导模共振

Graphene-based absorber exploiting guided mode resonances in one-dimensional gratings.

作者信息

Grande M, Vincenti M A, Stomeo T, Bianco G V, de Ceglia D, Aközbek N, Petruzzelli V, Bruno G, De Vittorio M, Scalora M, D'Orazio A

出版信息

Opt Express. 2014 Dec 15;22(25):31511-9. doi: 10.1364/OE.22.031511.

DOI:10.1364/OE.22.031511

PMID:25607101

Abstract

A one-dimensional dielectric grating, based on a simple geometry, is proposed and investigated to enhance light absorption in a monolayer graphene exploiting guided mode resonances. Numerical findings reveal that the optimized configuration is able to absorb up to 60% of the impinging light at normal incidence for both TE and TM polarizations resulting in a theoretical enhancement factor of about 26 with respect to the monolayer graphene absorption (≈2.3%). Experimental results confirm this behavior showing CVD graphene absorbance peaks up to about 40% over narrow bands of a few nanometers. The simple and flexible design points to a way to realize innovative, scalable and easy-to-fabricate graphene-based optical absorbers.

摘要

基于一种简单几何结构，提出并研究了一种一维介质光栅，以利用导模共振增强单层石墨烯中的光吸收。数值研究结果表明，对于TE和TM偏振，优化后的结构在正入射时能够吸收高达60%的入射光，相对于单层石墨烯的吸收率（约2.3%），理论增强因子约为26。实验结果证实了这种现象，显示出化学气相沉积（CVD）石墨烯在几纳米的窄波段上吸光度峰值高达约40%。这种简单且灵活的设计为实现创新、可扩展且易于制造的基于石墨烯的光吸收器指明了一条道路。