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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Single-mode ultraviolet whispering gallery mode lasing from a floating GaN microdisk.

Gangyi Zhu, Jiaping Li, Jitao Li

|February 15, 2018

Summary

Researchers created a novel floating Gallium Nitride (GaN) microdisk laser. This device achieves single-mode ultraviolet lasing, paving the way for high-quality, low-threshold photonic devices.

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Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Gallium Nitride (GaN) microdisks are promising for optoelectronic applications.
Achieving single-mode ultraviolet whispering gallery mode (WGM) lasing is crucial for advanced photonic devices.

Purpose of the Study:

To fabricate a floating GaN microdisk structure.
To demonstrate and characterize single-mode ultraviolet WGM lasing.
To confirm the WGM resonance mechanism through simulation.

Main Methods:

Fabrication using photolithography, dry-etching GaN, and isotropic wet-etching silicon.
Optical pumping of the GaN microdisk at room temperature.
Two-dimensional finite-difference time-domain (FDTD) simulations.

Main Results:

Successful fabrication of a floating GaN microdisk supported by a silicon pillar.
Observation of single-mode ultraviolet WGM lasing.
Characterization of lasing threshold, emission intensity, and mode number.
FDTD simulations confirmed the WGM resonance mechanism.

Conclusions:

The fabricated floating GaN microdisk enables single-mode ultraviolet WGM lasing.
The study demonstrates a pathway to high-quality factor and low-threshold WGM lasers.
This work contributes to the development of advanced ultraviolet optoelectronic devices.