W/VO<sub>2</sub>周期性纳米盘阵列可调中红外宽频吸收器

李政鹏; 李毅; 黄雅琴; 裴江恒; 田蓉; 刘进; 周建忠; 方宝英; 王晓华; 肖寒

doi:doi:10.3788/gzxb20194801.0123001

光子学报, 2019, 48 (1): 0123001, 网络出版: 2019-01-27

W/VO₂周期性纳米盘阵列可调中红外宽频吸收器

Tunable Mid-infrared Broadband Absorber Based on W/VO₂ Periodic Nanodisk Array

论文大纲

李政鹏 ^1,*李毅 ^1,2黄雅琴 ¹裴江恒 ¹田蓉 ¹刘进 ¹周建忠 ¹方宝英 ¹王晓华 ¹肖寒 ¹

作者单位

¹ 上海理工大学光电信息与计算机工程学院, 上海 200093

² 上海市现代光学系统重点实验室, 上海 200093

摘要

为了实现对3~5 μm中红外光的完美吸收, 仿真设计了一种基于W/VO2周期性纳米盘阵列的可调中红外宽频吸收器, 利用时域有限差分法模拟计算了结构参数对吸收器性能的影响.在最佳结构参数条件下, 吸收器表现出偏振无关和广角吸收的特性, 在3.1~3.6 μm范围内吸收率达99%以上, 峰值吸收率为99.99%.低温时入射光的磁场被束缚在各单元VO2介质层的中心并得到完美吸收; 高温时VO2发生相变表现为金属相, 抑制吸收, 高低温的吸收率差值可达78.8%.该吸收器有效弥补了传统吸收器吸收频带窄、吸收率不可调的缺陷, 对中红外光电器件的应用有参考价值.

Abstract

In order to realize the perfect absorption of 3~5 μm mid-infrared wave, a tunable mid-infrared broadband absorber based on W/VO2 periodic nanodisk array is designed in this paper. The effects of structural parameters on the absorption performance are calculated by the Finite-Difference Time-Domain. With the optimal structural parameters, the absorber is polarization-independent and exhibits wide-angle absorption. The absorptivity is over 99% in the range of 3.1~3.6 μm, and the maximum absorptivity is 99.99%. At low temperature, the absorber presents a perfect absorption because the magnetic field is trapped in the center of each cell's VO2 dielectric layer. While at high temperature, the VO2 film is converted to metallic phase in which the absorber displays a strong reflection. The absorption difference between high and low temperature is up to 78.8%. The absorber effectively compensates for the shortcomings of the traditional absorber with a narrow absorption band and inability to regulate the absorptivity. The result of this study is of valuable reference to the application of mid-infrared optoelectronic devices.

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李政鹏, 李毅, 黄雅琴, 裴江恒, 田蓉, 刘进, 周建忠, 方宝英, 王晓华, 肖寒. W/VO₂周期性纳米盘阵列可调中红外宽频吸收器[J]. 光子学报, 2019, 48(1): 0123001. LI Zheng-peng, LI Yi, HUANG Ya-qin, PEI Jiang-heng, TIAN Rong, LIU Jin, ZHOU Jian-zhong, FANG Bao-ying, WANG Xiao-hua, XIAO Han. Tunable Mid-infrared Broadband Absorber Based on W/VO₂ Periodic Nanodisk Array[J]. ACTA PHOTONICA SINICA, 2019, 48(1): 0123001.

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