Liu A, Li Z, Zou CL, She J, Wang Q, Ren X. Polarization-insensitive vortex beam generator by the holographic grating on an integrated multi-layer waveguide.
OPTICS LETTERS 2024;
49:97-100. [PMID:
38134163 DOI:
10.1364/ol.510235]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 11/22/2023] [Indexed: 12/24/2023]
Abstract
An integrated polarization-insensitive vortex beam generator is proposed in this study. It is composed of a holographic grating on a multi-layer waveguide, which enables conversion of Transverse Electric (TE) and Transverse Magnetic (TM) waveguide modes to y-polarized and x-polarized optical vortex beams, respectively. The conversion efficiency and the phase fidelity are numerically analyzed, and the working bandwidth is about 100 nm from 1500 nm to 1600 nm with a phase fidelity above 0.7. Moreover, the vortex beam with the superposition of the y-polarization and x-polarization states can be obtained with the incident of the superposition of TE and TM waveguide modes.
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