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Nanoprinted Diffractive Layer Integrated Vertical-Cavity Surface-Emitting Vortex Lasers with Scalable Topological

Yibo Dong¹, Guanzhong Pan², Meng Xun²

¹Institute of Photonic Chips, University of Shanghai for Science and Technology, Shanghai 200093 People's Republic of China.

|September 25, 2023

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Researchers developed chip-scale vortex lasers using nanoprinted OAM structures on VCSELs. This innovation enables higher topological charges, advancing optical information multiplexing.

Area of Science:

Optics and Photonics
Semiconductor Lasers
Nanotechnology

Background:

Vertical-cavity surface-emitting lasers (VCSELs) are promising for on-chip vortex beam generation.
Existing VCSEL-based vortex lasers have limitations in achieving high topological charges due to restricted device size and space-bandwidth product (SBP).

Purpose of the Study:

To demonstrate a chip-scale vortex microlaser with enhanced topological charge capabilities.
To overcome the limitations of SBP in VCSELs for vortex beam generation.

Main Methods:

Integration of nanoprinted OAM phase structures onto VCSELs.
Design and implementation of two-layer cascaded spiral phase plates to enhance SBP.
Fabrication of a monolithic microlaser array for addressable control.

Keywords:

cascaded spiral phase plates laser printing orbital angular momentum vertical-cavity surface-emitting laser vortex laser

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Main Results:

Demonstration of a vortex microlaser with a low threshold and simple structure.
Achieved addressable control of vortex beams with topological charges from l = 1 to l = 5.
Generated a vortex beam with a high topological charge of l = 15 and 83.7% mode purity using cascaded phase plates.

Conclusions:

Nanoprinting provides high flexibility for spatial structure manipulation in microlasers.
The developed technology overcomes SBP limitations, enabling higher topological charges.
This work enables future chip-scale optical information multiplexing with increased channel capacity.