中国物理B ›› 2020, Vol. 29 ›› Issue (10): 107303-.doi: 10.1088/1674-1056/ab9def

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Xiu Yang(杨秀)1, Tao Wei(魏涛)2, Feiliang Chen(陈飞良)3, Fuhua Gao(高福华)1,4, Jinglei Du(杜惊雷)1,4,†(), Yidong Hou(侯宜栋)1,‡()   

  • 收稿日期:2020-04-06 修回日期:2020-06-05 接受日期:2020-06-18 出版日期:2020-10-05 发布日期:2020-10-05
  • 通讯作者: Jinglei Du(杜惊雷), Yidong Hou(侯宜栋)

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

Xiu Yang(杨秀)1, Tao Wei(魏涛)2, Feiliang Chen(陈飞良)3, Fuhua Gao(高福华)1,4, Jinglei Du(杜惊雷)1,4,†, and Yidong Hou(侯宜栋)1,‡   

  1. 1 College of Physics, Sichuan University, Chengdu 610065, China
    2 School of Medical Information Engineering, Jining Medical University, Jining 272067, China
    3 Microsystem & Terahertz Research Center of CAEP, China Academy of Engineering Physics, Chengdu 610299, China
    4 High Energy Density Physics of the Ministry of Education Key Laboratory, Sichuan University, Chengdu 610064, China
  • Received:2020-04-06 Revised:2020-06-05 Accepted:2020-06-18 Online:2020-10-05 Published:2020-10-05
  • Contact: †Corresponding author. E-mail: dujl@scu.edu.cn第一通讯作者 ‡Corresponding author. E-mail: houyd@scu.edu.cn
  • About author:
    †Corresponding author. E-mail: dujl@scu.edu.cn
    ‡Corresponding author. E-mail: houyd@scu.edu.cn
    * Project supported by the National Natural Science Foundation of China (Grant No. 11604227).

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Abstract:

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 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.

Key words: chiroptical effect, chiral metamaterials, refractive index

中图分类号:  (Metamaterials for chiral, bianisotropic and other complex media)

  • 81.05.Xj
42.25.Bs (Wave propagation, transmission and absorption) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)) 42.25.-p (Wave optics)