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Polarization-insensitive vortex beam generator by the holographic grating on an integrated multi-layer waveguide
Optics Letters
|December 22, 2023
Summary
This study introduces a novel polarization-insensitive optical vortex beam generator using a holographic grating. It efficiently converts waveguide modes into distinct polarized vortex beams, enabling versatile optical applications.
Area of Science:
- Photonics
- Optical Engineering
- Waveguide Optics
Background:
- Optical vortex beams carry orbital angular momentum, enabling advanced applications in optical manipulation and communication.
- Generating polarization-controlled vortex beams from standard waveguide modes is crucial for integrated photonic devices.
Purpose of the Study:
- To propose and analyze an integrated device capable of generating polarization-insensitive optical vortex beams.
- To demonstrate the conversion of Transverse Electric (TE) and Transverse Magnetic (TM) waveguide modes into y-polarized and x-polarized optical vortex beams, respectively.
Main Methods:
- Numerical analysis of conversion efficiency and phase fidelity.
- Design utilizing a holographic grating on a multi-layer waveguide structure.
- Simulation of device performance across a specific wavelength range.
Main Results:
- Achieved conversion of TE and TM modes to y-polarized and x-polarized vortex beams.
- Demonstrated a working bandwidth of approximately 100 nm (1500-1600 nm).
- Obtained a phase fidelity exceeding 0.7 for the generated vortex beams.
Conclusions:
- The proposed device offers efficient and polarization-controlled generation of optical vortex beams.
- The integrated design is suitable for applications requiring versatile optical vortex manipulation.
- Superposition states of vortex beams can be generated by incident superposition of waveguide modes.
