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Inversed Vernier effect based single-mode laser emission in coupled microdisks.

Meng Li¹, Nan Zhang¹, Kaiyang Wang¹

¹Integrated Nanoscience Lab, Department of Electrical and Information Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.

Scientific Reports

|September 3, 2015

Summary

Researchers investigated single-mode laser operation in coupled microdisks. They found internal coupling within one cavity, not Vernier effects, dominates, advancing understanding of on-chip laser development.

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Area of Science:

Photonics
Optoelectronics
Nanotechnology

Background:

On-chip single-mode lasers in coupled microdisks are crucial for various applications.
Existing explanations (Vernier/inversed Vernier effects) lack experimental confirmation.

Purpose of the Study:

To elucidate the mechanism behind single-mode laser operation in coupled microdisks.
To experimentally validate the underlying principles of these advanced laser systems.

Main Methods:

Experimental investigation of laser emission spectra in coupled microdisk structures.
Analysis of mode behavior under varying pumping power from threshold to gain saturation.
Theoretical modeling to interpret experimental observations.

Main Results:

Mode numbers were significantly reduced, achieving near single-mode operation over a wide pumping range.
The primary lasing peak originated from one disk, with intensity correlating to wavelength detuning.
Experimental data strongly indicated dominance of internal coupling within a single cavity.

Conclusions:

The observed single-mode laser operation is primarily governed by internal cavity coupling, analogous to the inversed Vernier effect.
This finding provides critical insights into previous experimental results and guides future on-chip single-mode laser development.