Abstract
Chiral metasurfaces have different electromagnetic responses with circularly polarized lights, showing as circular dichroism and optical activity. Here, a novel kind of all-silicon chiral metasurface is proposed by introducing destructive interference between achiral meta-atoms. The maximum value of circular dichroism spectra can reach 0.49. By adding an antireflective layer at the side of the silicon substrate, the maximum circular dichroism reaches 0.54. What is more, the bandwidth of circular dichroism greater than 0.4 reaches 0.15 THz. Two samples are fabricated to verify the feasibility of this scheme, and the experimental results are in good agreement with the simulations. In addition, the proposed scheme can also be used to generate various interesting functions, such as beam control and vortex generator. This flexible and efficient implementation solution of chiral metasurface can bring new ideas to the development of chiral devices in the future.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 61675147, 61735010, and 91838301), National Key Research and Development Program of China (Grant No. 2017YFA0700202), Basic Research Program of Shenzhen (Grant No. JCYJ20170412154447469), and Program for Science & Technology Innovation Talents of Henan Province (Grant No. 202102310001).
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Zheng, C., Li, J., Li, J. et al. All-silicon chiral metasurfaces and wavefront shaping assisted by interference. Sci. China Phys. Mech. Astron. 64, 114212 (2021). https://doi.org/10.1007/s11433-021-1768-0
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DOI: https://doi.org/10.1007/s11433-021-1768-0