中国物理B ›› 2016, Vol. 25 ›› Issue (8): 84201-084201.doi: 10.1088/1674-1056/25/8/084201

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Enhanced chiral response from the Fabry-Perot cavity coupled meta-surfaces

Ze-Jian Yang(阳泽健), De-Jiao Hu(胡德骄), Fu-Hua Gao(高福华), Yi-Dong Hou(侯宜栋)   

  1. 1 College of Physical Science and Technology, Sichuan University, Chengdu 610064, China;
    2 Sino-British Joint Materials Research Institute, Sichuan University, Chengdu 610064, China
  • 收稿日期:2016-02-02 修回日期:2016-04-05 出版日期:2016-08-05 发布日期:2016-08-05
  • 通讯作者: Fu-Hua Gao E-mail:gaofuhua@scu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 61377054).

Enhanced chiral response from the Fabry-Perot cavity coupled meta-surfaces

Ze-Jian Yang(阳泽健)1,2, De-Jiao Hu(胡德骄)1,2, Fu-Hua Gao(高福华)1,2, Yi-Dong Hou(侯宜栋)1,2   

  1. 1 College of Physical Science and Technology, Sichuan University, Chengdu 610064, China;
    2 Sino-British Joint Materials Research Institute, Sichuan University, Chengdu 610064, China
  • Received:2016-02-02 Revised:2016-04-05 Online:2016-08-05 Published:2016-08-05
  • Contact: Fu-Hua Gao E-mail:gaofuhua@scu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 61377054).

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摘要：

The circular dichroism (CD) signal of a two-dimensional (2D) chiral meta-surface is usually weak, where the difference between the transmitted (or reflected) right and left circular polarization is barely small. We present a general method to enhance the reflective CD spectrum, by adding a layer of reflective film behind the meta-surface. The light passes through the chiral meta-surface and propagates towards the reflector, where it is reflected back and further interacts with the chiral meta-surface. The light is reflected back and forth between these two layers, forming a Fabry-Perot type resonance, which interacts with the localized surface plasmonic resonance (LSPR) mode and greatly enhances the CD signal of the light wave leaving the meta-surface. We numerically calculate the CD enhancing effect of an L-shaped chiral meta-surface on a gold film in the visible range. Compared with the single layer meta-surface, the L-shaped chiral meta-surface has a CD maximum that is dramatically increased to 1. The analysis of reflection efficiency reveals that our design can be used to realize a reflective circular polarizer. Corresponding mode analysis shows that the huge CD originates from the hybrid mode comprised of FP mode and LSPR. Our results provide a general approach to enhancing the CD signal of a chiral meta-surface and can be used in areas like biosensing, circular polarizer, integrated photonics, etc.

关键词: chiral meta-surfaces, hybridization, Fabry-Perot resonance

Abstract:

The circular dichroism (CD) signal of a two-dimensional (2D) chiral meta-surface is usually weak, where the difference between the transmitted (or reflected) right and left circular polarization is barely small. We present a general method to enhance the reflective CD spectrum, by adding a layer of reflective film behind the meta-surface. The light passes through the chiral meta-surface and propagates towards the reflector, where it is reflected back and further interacts with the chiral meta-surface. The light is reflected back and forth between these two layers, forming a Fabry-Perot type resonance, which interacts with the localized surface plasmonic resonance (LSPR) mode and greatly enhances the CD signal of the light wave leaving the meta-surface. We numerically calculate the CD enhancing effect of an L-shaped chiral meta-surface on a gold film in the visible range. Compared with the single layer meta-surface, the L-shaped chiral meta-surface has a CD maximum that is dramatically increased to 1. The analysis of reflection efficiency reveals that our design can be used to realize a reflective circular polarizer. Corresponding mode analysis shows that the huge CD originates from the hybrid mode comprised of FP mode and LSPR. Our results provide a general approach to enhancing the CD signal of a chiral meta-surface and can be used in areas like biosensing, circular polarizer, integrated photonics, etc.

Key words: chiral meta-surfaces, hybridization, Fabry-Perot resonance

中图分类号:  (Wave propagation, transmission and absorption)

  • 42.25.Bs
42.25.Ja (Polarization)