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Enhanced and tunable circular dichroism in the visible waveband by coupling of the waveguide mode and local surface plasmon resonances in double-layer asymmetric metal grating |
| Liu-Li Wang(王刘丽)1, Yang Gu(顾阳)1, Yi-Jing Chen(陈怡静)1, Ya-Xian Ni(倪亚贤)2,†, and Wen Dong(董雯)1,‡ |
1 School of Physical Science and Technology, Soochow University, Suzhou 215006, China;
2 Soochow College, Soochow University, Suzhou 215006, China |
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Abstract Circular dichroism (CD) has shown very interesting possibilities as a means to characterize the chiral signal of a chiral structure. Here, we theoretically demonstrated enhanced and tunable CD in the visible light regime using a composite structure consisting of a double-layer metal grating gaped by a dielectric waveguide layer. Based on the coupling of the waveguide modes and the localized plasmonic resonances, the CD could reach a maximum value as high as 0.52 at 635 nm, which is four times higher than the CD value obtained in a conventional double-layer grating without the waveguide coupling effect. Furthermore, the spectral positions of the enhanced CD bands could be easily tuned by controlling the structural parameters. The proposed hybrid double-grating and waveguide structures could have potential applications in chiral selective imaging, sensing and spectroscopy, especially where the transmission measurement is required.
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Received: 23 November 2021
Revised: 27 March 2022
Accepted manuscript online: 06 April 2022
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PACS:
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81.05.Xj
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(Metamaterials for chiral, bianisotropic and other complex media)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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42.79.Gn
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(Optical waveguides and couplers)
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42.79.Dj
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(Gratings)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11474215). |
Corresponding Authors:
Ya-Xian Ni, Wen Dong
E-mail: niyaxian@suda.edu.cn;dongwen@suda.edu.cn
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Cite this article:
Liu-Li Wang(王刘丽), Yang Gu(顾阳), Yi-Jing Chen(陈怡静), Ya-Xian Ni(倪亚贤), and Wen Dong(董雯) Enhanced and tunable circular dichroism in the visible waveband by coupling of the waveguide mode and local surface plasmon resonances in double-layer asymmetric metal grating 2022 Chin. Phys. B 31 118103
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