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Related Experiment Video

Updated: Feb 8, 2026

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

Published on: January 29, 2013

Electrically pumped single-mode microlasers with omnidirectional radiation for optical broadcasting communication.

Feifan Xu^1,2, Jushi Liu^2,3, Yimeng Sang^2,3

¹School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.

Science Advances

|February 6, 2026

Summary

Researchers developed robust, electrically pumped blue microlasers using semiconductor whispering gallery modes (WGMs). These compact lasers offer high performance for visible-light communication, overcoming previous fabrication challenges.

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Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Semiconductor whispering gallery mode (WGM) microlasers are ideal for on-chip visible-light communication due to their size, high Q factors, and in-plane emission.
Challenges include fabrication robustness, precise mode selection, narrow linewidths, and low thresholds for WGM-visible microlasers.

Purpose of the Study:

To develop a scalable fabrication strategy for continuous-wave, electrically pumped WGM blue microlasers.
To achieve low threshold current densities and high slope efficiencies in III-nitride semiconductor microlasers.
To enable single-mode operation and high-speed data transmission for visible-light communication.

Main Methods:

Fabrication of III-nitride semiconductor WGM microlasers with diameters ranging from 10 to 160 micrometers.
Implementation of waveguide structures for effective vertical optical confinement.
Conversion of microdisk cavities to microrings to suppress high-order WGMs and achieve single-mode operation.

Main Results:

Achieved low threshold current densities and high slope efficiencies in electrically pumped WGM blue microlasers.
Demonstrated atomically smooth surfaces minimizing sidewall scattering.
Obtained a high Q factor of 17,066 in single-mode microring resonators.
Exhibited angle-independent, high-modulation bandwidths enabling synchronous broadcasting communication.

Conclusions:

The scalable fabrication strategy yields high-performance WGM blue microlasers.
Waveguide confinement and smooth surfaces are critical for laser performance.
Microring cavities enable single-mode operation suitable for high-data-rate visible-light communication.