Subwavelength Broadband Photonic Spin Hall Devices via Optical Slot Antennas. Issue 5 (18th March 2021)

• Record Type: Journal Article
• Authors: He, Axin; Xu, Yi; Gao, Baowei; Zhang, Tongzhou; Zhang, Jiasen
• Is Part Of: Laser & photonics reviews. Volume 15:Issue 5(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-03-18
• Subjects: antenna pair arrays -- broadband response -- L‐shaped optical slot antennas -- photonic spin Hall effect -- subwavelength photonic spin Hall devices; Lasers -- Periodicals; Photonics -- Periodicals; Lasers -- Périodiques; Photonique -- Périodiques; 621.36
• DOI: 10.1002/lpor.202000460
• Languages: English
• ISSNs: 1863-8880

Abstract

Abstract: The photonic spin Hall effect, wherein left‐ and right‐handed circularly polarized components can be separated during transportation after reflection or refraction by an optical interface through spin–orbit interaction, has gained increasing attention from the scientific and technological fields. Here, broadband subwavelength photonic spin Hall devices (PSHDs) are demonstrated on the basis of L‐shaped optical slot antennas. A basic PSHD comprises two L‐shaped slot antennas with a footprint size of 300 nm × 700 nm. The angle between the two radiation directions of the incident lights with different spins varies from 56° to 31° in the wavelength range of 750 to 850 nm. An array of antenna pairs is used to control radiation directions and improve the performance of the PSHDs. The proposed PSHDs are highly useful in integrated nanophotonic devices given their ultrasmall size, broadband response, and flexible design method. Abstract : Photonic spin Hall effect (PSHE) is observed via a subwavelength photonic spin Hall device with a size of 300 nm × 700 nm in a wavelength range of 750–850 nm. The PSHE arises from the interference of the resonant modes of L‐shaped optical slot antenna pairs. The radiation directionality can be controlled by periodic structures of the antenna pairs.