Year: 2026
Type: article
Abstract: ABSTRACT Phonon laser sensors offer powerful label‐free detection, yet their sensitivity remains bounded by noise for which robust suppression strategies are still lacking. Here we introduce a technique for diluting thermomechanical noise that counter‐intuitively selects lower‐Q optical modes to suppress thermal fluctuations of phonon‐laser frequency, followed by active feedback locking for frequency stabilization. The combined approach enables real‐time detection of single 10 nm‐radius polystyrene particles based on a microbubble cavity with a 38 MHz phonon mode, estimating a mass limit of . We further apply the platform to study iron–oxide uptake and reaction dynamics in cells.
Source: Laser & Photonics Review
DOI: 10.1002/lpor.72116
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W7223880977