Story perspectives

Microlaser Breakthrough Enhances Single-Molecule Detection Sensitivity

3/26/2026

Summary

Story summary

The study used microspheres 70 to 110 um in diameter as microlaser resonators coated with Yb3+-doped sol-gel to enable low-threshold lasing with Q factors of 105–106.
The microlaser emitted between 1,030 and 1,100 nm in water after 972 nm excitation.
Plasmonic gold nanoparticles enhanced single-molecule detection by causing mode splitting in laser output.
The beatnote spectrum revealed frequencies near 30 MHz and 34 MHz, enabling sensitive molecular detection.

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Story summary

The study used microspheres 70 to 110 um in diameter as microlaser resonators coated with Yb3+-doped sol-gel to enable low-threshold lasing with Q factors of 105–106.
The microlaser emitted between 1,030 and 1,100 nm in water after 972 nm excitation.
Plasmonic gold nanoparticles enhanced single-molecule detection by causing mode splitting in laser output.
The beatnote spectrum revealed frequencies near 30 MHz and 34 MHz, enabling sensitive molecular detection.