Affiliation:
1. Nanjing University
2. University of Science and Technology of China
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.
Funder
CAS Project for Young Scientists in Basic Research
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Natural Science Foundation of Jiangsu Province
Industrial Prospect and Key Core Technology Projects of Jiangsu Provincial Key R & D Program
Subject
Atomic and Molecular Physics, and Optics