Author(s): Jia, GY (Jia, Guangyi); Huang, ZX (Huang, Zhenxian); Zhou, Y (Zhou, Yan); Wang, HW (Wang, Huaiwen); Zhang, YL (Zhang, Yongliang); Miao, XL (Miao, Xianglong)

Source: PHYSICAL CHEMISTRY CHEMICAL PHYSICS DOI: 10.1039/d1cp00963j Early Access Date: MAY 2021

Abstract: Chiral metasurfaces patterned with L-shaped holes in a thin film of Dirac semimetal Cd3As2 are designed. The impact of temperature T on circular conversion dichroism, mainly characterized by circular polarization differential transmittance (CPDT), is studied by rigorous coupled-wave analysis. The results show that decreasing T will give rise to the appearance of much more narrow CPDT peaks and dips, and the maximum differential transmittance between two opposite circularly polarized light can reach above 0.60 by optimizing the structural parameters at 80 K. As the T increases, the differential transmittance gradually decreases, and the CPDT peak and dip values exhibit variation tendencies of 'Z' and 'S' types, respectively. Two simple formulae of CPDT extreme values with respect to T are derived, predicting that the decreasing tendency will reach saturation when T >= 500 K. Differing from the wavelength-independent variation trend of differential transmittance, CPDT extremum positions mainly show a blueshift (redshift) tendency at the wavelength lambda > 10 mu m (lambda < 5 mu m) as the T increases. Moreover, evolutions of CPDT with various factors including the thickness of Cd3As2, incident and azimuth angles are also clearly unveiled.

Accession Number: WOS:000656904900001

PubMed ID: 34075977

ISSN: 1463-9076

eISSN: 1463-9084

Full Text: https://pubs.rsc.org/en/content/articlelanding/2021/CP/D1CP00963J#!divAbstract