Dynamic terahertz anisotropy and chirality enhancement in liquid-crystal anisotropic dielectric metasurfaces

Hui-Jun Zhao; Fei Fan; Tian-Rui Zhang; Yun-Yun Ji; Sheng-Jiang Chang

doi:10.1364/prj.453082

journal article Mar 29, 2022

Dynamic terahertz anisotropy and chirality enhancement in liquid-crystal anisotropic dielectric metasurfaces

Hui-Jun Zhao Fei Fan

Tian-Rui Zhang Yun-Yun Ji Sheng-Jiang Chang

Photonics Research Vol. 10 No. 4 pp. 1097 · Optica Publishing Group

View at Publisher Save 10.1364/prj.453082

Abstract

To enhance and actively control terahertz (THz) anisotropy and chirality, we have designed and fabricated a THz composite device with a liquid crystal (LC) layer and Si anisotropic metasurface. By initial anchoring and electrically rotating the spatial orientation of the LC optical axis, the different symmetry relationships are obtained in this hybrid device. When the optical axis of LC is parallel or perpendicular to the optical axis of the Si metasurface, the anisotropy of the device will be enhanced or offset, which leads to a tunable phase-shift range of more than 180°. When there is an angle between the two optical axes, due to the destruction of the mirror symmetry in the LC-Si anisotropic medium, the highest circular dichroism of the device reaches 30 dB in the middle orientation state of the LC optical axis, and the active modulation can be realized by changing the bias electric field on the LC layer. This composite device demonstrates rich characteristics for the feasible manipulation of THz polarization conversion and chiral transmission, which can be applied in THz polarization imaging and chiral spectroscopy.

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Metrics

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Citations

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References

Details

Published: Mar 29, 2022
Vol/Issue: 10(4)
Pages: 1097

Authors

Nankai University

Nankai University; Network

Nankai University

Nankai University

Nankai University; Network

Funding

National Natural Science Foundation of China Award: 61831012

National Key Research and Development Program of China Award: 2017YFA0701000

Natural Science Foundation of Tianjin City Award: 19JCYBJC16600

Cite This Article

Hui-Jun Zhao, Fei Fan, Tian-Rui Zhang, et al. (2022). Dynamic terahertz anisotropy and chirality enhancement in liquid-crystal anisotropic dielectric metasurfaces. Photonics Research, 10(4), 1097. https://doi.org/10.1364/prj.453082

Dynamic terahertz anisotropy and chirality enhancement in liquid-crystal anisotropic dielectric metasurfaces

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