| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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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 College of Physical Science and Technology, Sichuan University, Chengdu 610064, China;
2 Sino-British Joint Materials Research Institute, Sichuan University, Chengdu 610064, China |
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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.
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Received: 02 February 2016
Revised: 05 April 2016
Accepted manuscript online:
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PACS:
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42.25.Bs
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(Wave propagation, transmission and absorption)
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42.25.Ja
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(Polarization)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61377054). |
Corresponding Authors:
Fu-Hua Gao
E-mail: gaofuhua@scu.edu.cn
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Cite this article:
Ze-Jian Yang(阳泽健), De-Jiao Hu(胡德骄), Fu-Hua Gao(高福华), Yi-Dong Hou(侯宜栋) Enhanced chiral response from the Fabry-Perot cavity coupled meta-surfaces 2016 Chin. Phys. B 25 084201
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