Enhanced and tunable circular dichroism in the visible waveband by coupling of the waveguide mode and local surface plasmon resonances in double-layer asymmetric metal grating

作     者：Liu-Li Wang Yang Gu Yi-Jing Chen Ya-Xian Ni Wen Dong 王刘丽;顾阳;陈怡静;倪亚贤;董雯

作者机构：School of Physical Science and TechnologySoochow UniversitySuzhou 215006China Soochow CollegeSoochow UniversitySuzhou 215006China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2022年第31卷第11期

页      面：599-604页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 070204[理学-等离子体物理] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11474215) 

主　　题：circular dichroism chiral metamaterial waveguide surface plasmon 

摘      要：Circular dichroism(CD)has shown very interesting possibilities as a means to characterize the chiral signal of a chiral ***,we theoretically demonstrated enhanced and tunable CD in the visible light regime using a composite structure consisting of a double-layer metal grating gaped by a dielectric waveguide *** on the coupling of the waveguide modes and the localized plasmonic resonances,the CD could reach a maximum value as high as 0.52 at635 nm,which is four times higher than the CD value obtained in a conventional double-layer grating without the waveguide coupling ***,the spectral positions of the enhanced CD bands could be easily tuned by controlling the structural *** proposed hybrid double-grating and waveguide structures could have potential applications in chiral selective imaging,sensing and spectroscopy,especially where the transmission measurement is required.