Author(s): Guo, ZF (Guo, Zhengfeng); Gu, HG (Gu, Honggang); Yu, YL (Yu, Yali); Wei, ZM (Wei, Zhongming); Liu, SY (Liu, Shiyuan)

Source: NANOMATERIALS Volume: 13 Issue: 1 Article Number: 134 DOI: 10.3390/nano13010134 Published: JAN 2023

Abstract: Optical anisotropy offers an extra degree of freedom to dynamically and reversibly regulate polarizing optical components, such as polarizers, without extra energy consumption and with high modulating efficiency. In this paper, we theoretically and numerically design broadband and incident-angle-modulation near-infrared polarizers, based on the SnSe, whose optical anisotropy is quantitatively evaluated by the complete dielectric tensor, complex refractive index tensor, and derived birefringence (similar to|Delta n|(max) = 0.4) and dichroism (similar to|Delta k|(max) = 0.4). The bandwidth of a broadband polarizer is 324 nm, from 1262 nm to 1586 nm, with an average extinction ratio above 23 dB. For the incident-angle-modulation near-infrared polarizer, the high incident angles dynamically and reversibly modulate its working wavelength with a maximum extinction ratio of 71 dB. Numerical simulations and theoretical calculations reveal that the considerable absorption for p light and continuously and relatively low absorption of s light lead to the broadband polarizer, while the incident-angle-modulation one mainly arises from the blue shift of corresponding wavelength of p light's minimum reflectance. The proposed novel design of polarizers based on SnSe are likely to be mass-produced and integrated into an on-chip system, which opens up a new thought to design polarizing optical components by utilizing other low-symmetry materials.

Accession Number: WOS:000909865800001

PubMed ID: 36616044

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Guo, Zhengfeng                  0000-0002-5104-6215

Liu, Shiyuan         H-1463-2012         0000-0002-0756-1439

Gu, Honggang                  0000-0001-8812-1621

eISSN: 2079-4991

Full Text: https://www.mdpi.com/2079-4991/13/1/134