Quantum Sensing of Motion in Colloids via Time-Dependent Purcell Effect

Alexey S. Kadochkin*, Ivan I. Shishkin, Alexander S. Shalin, Pavel Ginzburg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Light–matter interaction dynamics is governed by the strength of local coupling constants, tailored by surrounding electromagnetic structures. Characteristic decay times in dipole-allowed fluorescent transitions are much faster than mechanical conformational changes within an environment and, as a result, the latter can be assumed static during the emission process. However, slow-decaying compounds can break this commonly accepted approximation and introduce new interaction regimes. Here, slow-decaying phosphorescent compounds are proposed to perform quantum sensing of the nearby structure's motion via observation of collective velocity-dependent lifetime distributions. In particular, characteristic decay of an excited dye molecule, being comparable with its passage time next to a resonant particle, is modified via time-dependent Purcell enhancement, which leaves distinct signatures on properties of emitted light. Velocity mapping of uniformly moving particles within a fluid solution of phosphorescent dyes is demonstrated via the analysis of modified lifetime distributions. The proposed interaction regime enables performing studies of a wide range of phenomena, where time-dependent light–matter interaction constants can be utilized for extraction of additional information about a process.

Original languageEnglish
Article number1800042
JournalLaser and Photonics Reviews
Issue number9
StatePublished - Sep 2018


FundersFunder number
Horizon 2020 Framework Programme802279
European Research Council
United States-Israel Binational Science Foundation2016059
Russian Foundation for Basic Research18-02-00414, 18- 52-00005
Ministry of Education and Science of the Russian Federation08-08, 3.4982.2017/6.7
Russian Science Foundation18-72-10127


    • fluid flow
    • local field enhancement
    • mesoscopic models
    • purcell effect
    • spontaneous emission
    • time-varying media


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