Enhanced reflection chiroptical effect of planar anisotropic chiral metamaterials placed on the interface of two media

作     者：Xiu Yang Tao Wei Feiliang Chen Fuhua Gao Jinglei Du Yidong Hou 杨秀;魏涛;陈飞良;高福华;杜惊雷;侯宜栋

作者机构：College of PhysicsSichuan UniversityChengdu 610065China School of Medical Information Engineeringlining Medical UniversityJining 272067China Microsystem&Terahertz Research Center of CAEPChina Academy of Engineering PhysicsChengdu 610299China High Energy Density Physics of the Ministry of Education Key LaboratorySichuan UniversityChengdu 610064China 

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

年 卷 期：2020年第29卷第10期

页      面：464-472页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 11604227) 

主　　题：chiroptical effect chiral metamaterials refractive index 

摘      要：The strong chiroptical effect is highly desirable and has a wide range of applications in biosensing, chiral catalysis,polarization tuning, and chiral photo detection. In this work, we find a simple method to enhance the reflection circular dichroism(CDR) by placing the planar anisotropic chiral metamaterials(i.e., Z-shaped PACMs) on the interface of two media(i.e., Z-PCMI) with a large refractive index difference. The maximum reflection CDR from the complex system can reach about 0.840 when the refractive index is set as ntop = 4.0 and nbottom = 1.49, which is approximately three times larger than that of placing the Z-shaped PACMs directly on the substrate(i.e., Z-PCMS). While the minimum reflection CDR is 0.157 when the refractive index is set as ntop = 1.0 and nbottom = 1.49. So we can get a large available range of reflection CDR from -0.840 to -0.157. Meanwhile, the transmission CDT remains unchanged with the refractive index ntop increment. Our in-depth research indicates that the large reflection CDR is derived from the difference of non-conversion components of the planar anisotropic chiral metamaterials’ reflection matrices. In short, we provide a simple and practical method to enhance the chiroptical effect by changing the refractive index difference between two media without having to design a complex chiral structure.