Light Enhanced Absorption of Graphene Based on Parity-time Symmetry Structure

Ling-jun YI; Chang-hong LI

doi:10.37188/CJL.20210322

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Light Enhanced Absorption of Graphene Based on Parity-time Symmetry Structure

Device Fabrication and Physics | 更新时间：2022-01-14

- Light Enhanced Absorption of Graphene Based on Parity-time Symmetry Structure
  增强出版
- 发光学报 Vol. 43, Issue 1, Pages: 119-128(2022)
- 作者机构：
  
  青岛大学　电子信息学院，山东　青岛　266071
- 作者简介：
  
  [ "易凌俊(1994-)，男，河南南阳人，硕士研究生，2018年于南阳理工学院获得学士学位，主要从事光子晶体光学器件等方面的研究。E-mail: photoniccrystal@163.com" ]
  [ "李长红(1973-)，女，山东兖州人，博士，副教授，硕士生导师，2008年于北京邮电大学获得博士学位，主要从事宽带通信网、光信息处理、光子晶体器件、纳米光子学以及太阳能收集等方面的研究。E-mail: jiluch@126.com" ]
- 基金信息：
  
  国家自然科学基金(61307050;61701271);山东省自然科学基金(ZR2016AM27)
- DOI：10.37188/CJL.20210322
  CLC： O613.71;O734
- Received：11 October 2021，
  
  Revised：2021-10-29，
  
  Published：2022-01
- 稿件说明：
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Ling-jun YI, Chang-hong LI. Light Enhanced Absorption of Graphene Based on Parity-time Symmetry Structure[J]. 发光学报, 2022, 43(1): 119-128.
DOI：

Ling-jun YI, Chang-hong LI. Light Enhanced Absorption of Graphene Based on Parity-time Symmetry Structure[J]. 发光学报, 2022, 43(1): 119-128. DOI： 10.37188/CJL.20210322.

摘要

为增强石墨烯对近红外通信波段光波的吸收，提出了一种基于周期性宇称-时间(Parity-time)对称结构的石墨烯基吸收器，该结构由顶层的石墨烯层和底层周期性PT对称单元构成. 采用传输矩阵方法系统地研究了该结构中石墨烯对1 450~1 650 nm波长范围内光波的吸收特性. 结果表明，通过优化石墨烯复合PT对称微纳结构参数，对于所研究波长范围内垂直入射的近红外光波，单层石墨烯的平均吸收增强了35倍. 同时，对入射角在0°~30°范围内的光波，结构对TE极化波和TM极化波的平均吸收分别增强了19.7倍和54倍. 该结构对近红外通信波段光波具有高强度吸收特性，可广泛用于吸收器、光电探测器和红外光学传感器等器件的设计.

Abstract

To enhance the absorption of graphene for optical waves in near-infrared communication wavelengths

a graphene-based absorber based on a periodic parity-time(PT) symmetry structure was proposed

which consists of the top graphene layer and the underlying periodic PT-symmetry unit. The absorption properties of graphene in the wavelength range of 1 450-1 650 nm are systematically studied by the transfer matrix method(TMM). The results show that by optimizing the graphene composite PT-symmetry micronano structure parameters

a 35-fold absorptance enhancement was achieved for the normal incidence near-infrared light in the studied wavelength range as compared to the free-standing graphene absorption. Meanwhile

for the oblique incidence near-infrared light with angle ranging from 0° to 30°

the average absorptance of the TE and TM polarization light is also enhanced by 19.7 and 54 folds

respectively. The structure has high-intensity absorption characteristics for the near-infrared light

which can be widely used in the design of devices such as absorbers

photodetectors and infrared optical sensors.

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references

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Ling-jun YI

Chang-hong LI

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College of Electronic Information， Qingdao University

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