混合谐振模式宽带长波红外超表面吸收器研究  

Study on long wavelength infrared broadband metasurface absorber via hybrid resonant mode

作　　者：罗奕 梁中翥[1] 孟德佳 陶金 梁静秋[1] 秦正 候恩柱 秦余欣[1] 吕金光[1] 张宇昊 LUO Yi;LIANG Zhong-zhu;MENG De-jia;TAO Jin;LIANG Jing-qiu;QIN Zheng;HOU En-Zhu;QIN Yu-xin;LV Jing-guang;ZHANG Yu-hao(State Key Laboratory of Applied Optics,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《中国光学》2020年第1期131-139,共9页Chinese Optics

基　　金：国家自然科学基金(No.61735018,No.61376122,No.61805242);中国科学院青年创新促进会优秀会员基金(No.2014193);吉林省科技发展计划重点科技攻关项目(No.20170204077GX);吉林省中青年科技创新领军人才及团队项目(No.20190101012JH);应用光学国家重点实验室自主基金;长春光机所-杜克大学国际合作基金;长春光机所-复旦大学合作基金~~

摘　　要：为了满足红外探测器件集成化和对红外宽光谱范围吸收的需求,设计了一种工作在长波红外波段(8~14μm)的超宽带、高吸收、极化不敏感的超材料吸收器。通过在金属-介质-金属三层异质的超材料吸收器结构的顶部金属周围镶嵌一层介质形成超表面,以增加谐振强度和吸收带宽。在8~13.6μm的带宽范围内,该结构有超过90%的平均吸收率,覆盖了大部分长波红外大气窗口波段,对红外探测领域有着重要意义。研究结果表明:镶嵌的金属-介质组成的介质波导模式和谐振腔模式的结合以及传播型表面等离激元模式的激发是形成宽带高吸收的主要原因,并且谐振模式的谐振波长可以通过相关参数来进行调控。本文的研究结果为可调谐宽带长波红外吸收材料的设计提供参考,该设计方法可推广到中波红外波段、甚至长波红外或其它波段。In order to meet the requirements of integration of infrared devices and the wideband absorption of infrared light,a novel ultra-broadband,high-absorbance and polarization-independent metamaterial absorber working in the long-wave infrared region(8~14μm)is designed.By inserting a dielectric layer around the top metal of a metal-dielectric-metal metamaterial absorber to form a metasurface,the resonance intensity and absorption bandwidth can be improved.The structure has an average absorptivity greater than 90%in the range of 8.0μm to 13.6μm,covering most of the long-wave infrared atmospheric window bands,which is of great significance to infrared devices.The results indicate that the excitation of Propagating Surface Plasmon(PSP)modes and embedded cavity modes generated by the combination of dielectric-loaded surface plasmon polaritons waveguide and cavity modes contribute to broadband absorption.Moreover,the resonant wavelength of the resonance mode can be tuned by relevant parameters.The results of this paper provide a reference for the design of tunable broadband long-wavelength infrared(LWIR)absorbers.It is suggested that this design method can be extended to the medium wavelength infrared band,the very long-wavelength infrared band and others.

关 键 词：超材料吸收器 长波红外 介质波导 谐振腔模式 

分 类 号：TN21[电子电信—物理电子学]