Enhanced chiral response from the Fabry–Perot cavity coupled meta-surfaces |
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引用本文: | 阳泽健,胡德骄,高福华,侯宜栋. Enhanced chiral response from the Fabry–Perot cavity coupled meta-surfaces[J]. 中国物理 B, 2016, 25(8): 84201-084201. DOI: 10.1088/1674-1056/25/8/084201 |
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作者姓名: | 阳泽健 胡德骄 高福华 侯宜栋 |
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作者单位: | 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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基金项目: | 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.
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收稿时间: | 2016-02-02 |
Enhanced chiral response from the Fabry-Perot cavity coupled meta-surfaces |
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Affiliation: | 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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Keywords: | chiral meta-surfaces hybridization Fabry-Perot resonance |
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