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Monolithically multi-color lasing from an InGaN microdisk on a Si substrate.

M Athanasiou¹, R M Smith¹, J Pugh²

¹Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, United Kingdom.

Scientific Reports

|September 1, 2017

Summary

This summary is machine-generated.

Researchers developed a novel, optically pumped multi-color laser using an Indium Gallium Nitride/Gallium Nitride (InGaN/GaN) micro-disk. This cost-effective laser achieves three distinct lasing peaks at room temperature, confirmed by photoluminescence measurements.

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Area of Science:

Semiconductor Lasers
Optoelectronics
Materials Science

Background:

Indium Gallium Nitride (InGaN) and Gallium Nitride (GaN) are crucial materials for optoelectronic devices.
Micro-disk lasers offer potential for miniaturization and integrated photonic circuits.
Whispering gallery (WG) modes in micro-disk lasers can be challenging to control for multi-color emission.

Purpose of the Study:

To achieve optically pumped multi-color laser emission from an InGaN/GaN micro-disk.
To suppress vertical components of whispering gallery modes for cleaner lasing peaks.
To demonstrate a cost-effective fabrication method for micro-disk lasers.

Main Methods:

Fabrication of an InGaN/GaN micro-disk laser (approx. 1 μm diameter) on a silicon substrate using microsphere lithography and dry/wet etching.
Optical pumping using a continuous-wave diode laser at room temperature.
Time-resolved micro photoluminescence (PL) measurements to analyze excitonic recombination dynamics.
Three-dimensional finite-difference-time-domain (FDTD) simulations for structure design.

Main Results:

Successfully achieved optically pumped multi-color laser emission.
Observed three distinct, clean lasing peaks at 442 nm, 493 nm, and 522 nm.
Confirmed lasing behavior through time-resolved micro PL measurements, analyzing excitonic recombination dynamics.
Demonstrated effective suppression of vertical WG mode components through structural design.

Conclusions:

An InGaN/GaN micro-disk laser with an undercut structure can produce multi-color laser emission.
The developed fabrication technique, combining microsphere lithography and etching, is cost-effective.
The suppression of vertical WG modes is critical for achieving clean, multi-color lasing peaks.
This work presents a promising approach for developing compact, multi-color laser sources for various applications.