Thermomechanical Noise Dilution by Low‐Q Cavity for Nanoparticles Detection
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.
Authors
- Hao Tian (ORCID: https://orcid.org/0000-0003-1909-7511)
- Fang‐Wen Sun (ORCID: https://orcid.org/0000-0002-9625-7390)
- Chun‐Hua Dong (ORCID: https://orcid.org/0000-0002-9408-6102)
- Xi‐Feng Ren (ORCID: https://orcid.org/0000-0001-6559-8101)
- Zhen Shen (ORCID: https://orcid.org/0000-0002-7380-1963)
- Yu Wang (ORCID: https://orcid.org/0000-0002-3293-0478)
- Guo G (ORCID: https://orcid.org/0000-0003-3771-9185)
- Rui Niu
- Yu‐Xuan Chen
- Yi‐Wen Huang
- Gui‐Wen Zheng
- Tian Tian
Institutions
- University of Science and Technology of China (CN)
- Harbin Institute of Technology (CN)
- Quantum Design (Germany) (DE)
- QuantumCTek (China) (CN)
- Nanjing Medical University (CN)
Publication Details
- Journal
- Laser & Photonics Review
- Published
- 2026-10-27
- DOI
- https://doi.org/10.1002/lpor.72116
- Primary Topic
- Mechanical and Optical Resonators
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China
- University of Science and Technology of China
- National Science and Technology Major Project
- Natural Science Foundation of Anhui Province
- Fundamental Research Funds for the Central Universities