Spin Hall Effect of Light with Near‐Unity Efficiency in the Microwave. Issue 2 (6th December 2020)

• Record Type: Journal Article
• Authors: Kim, Minkyung; Lee, Dasol; Cho, Hyukjoon; Min, Bumki; Rho, Junsuk
• Is Part Of: Laser & photonics reviews. Volume 15:Issue 2(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-12-06
• Subjects: high efficiency -- microwave -- optical spin Hall effect -- photonic spin Hall effect -- spin–orbit coupling -- Stokes polarimetry; Lasers -- Periodicals; Photonics -- Periodicals; Lasers -- Périodiques; Photonique -- Périodiques; 621.36
• DOI: 10.1002/lpor.202000393
• Languages: English
• ISSNs: 1863-8880

Abstract

Abstract: The spin Hall effect of light (SHEL) refers to a transverse and spin‐dependent shift of light in real space at an optical interface. Previous studies of enhancing the SHEL have involved extremely low efficiency, and achieving a large SHEL and high efficiency simultaneously has never been reported. Here, an approach using anisotropic impedance mismatching to attain a large SHEL with near‐unity efficiency in the microwave spectrum is proposed. A wire medium that has a near‐unity transmission for one polarization and low transmission for the other is used to achieve high efficiency. The spin‐dependent splitting is experimentally confirmed by measuring transmission coefficients and the spatial profile of Stokes parameters. The large SHEL with near‐unity efficiency will enable highly efficient devices with spin‐selective functionalities. Abstract : Simultaneously achieving both a large spin Hall effect of light and a high efficiency has remained a challenge. Using anisotropic impedance mismatching, an approach to attain a large spin Hall effect of light with near‐perfect efficiency is proposed. A transverse shift that exceeds 1.5‐times wavelength is demonstrated along with a high efficiency that reaches nearly 100 % in microwave regime.