Laser-as-a-sensor: monolithic VCSEL oxygen detector shrinks sampling volume to subnanoliter
jwt0625 · x · 2026-11-11
Sharing a novel approach: putting the sensing element inside the laser cavity itself. The author notes sensitivity isn't improved, but sensor volume shrinks dramatically. The paper (Wang 2026) demonstrates a monolithically integrated MEMS-VCSEL with active intracavity enhancement for oxygen detection, using a 10μm resonant cavity with subnanoliter sampling volume — replacing 1m external-cavity optical paths with a fingertip-sized chip.
Related event: Laser-as-a-Sensor approach shrinks oxygen sensing volume to sub-nanoliter(2 posts)→
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