
1.School of Information and Communication Engineering, State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China
2.Institute of Electromagnetics and Acoustics, Xiamen University, Xiamen, 361005, China
3.State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, 100871, China
4.Department of Physics and Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing, 100875, China
5.Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China
6.Peking University Yangtze Delta Institute of Optoelectronics, Nantong, 226010, China
Yun-Feng Xiao (yfxiao@pku.edu.cn)
Published:31 July 2021,
Published Online:16 June 2021,
Received:20 April 2021,
Revised:15 May 2021,
Accepted:01 June 2021
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Yang, D. Q. et al. Operando monitoring transition dynamics of responsive polymer using optofluidic microcavities. Light: Science & Applications, 10, 1339-1346 (2021).
Yang, D. Q. et al. Operando monitoring transition dynamics of responsive polymer using optofluidic microcavities. Light: Science & Applications, 10, 1339-1346 (2021). DOI: 10.1038/s41377-021-00570-1.
Optical microcavities have become an attractive platform for precision measurement with merits of ultrahigh sensitivity
miniature footprint and fast response. Despite the achievements of ultrasensitive detection
optical microcavities still face significant challenges in the measurement of biochemical and physical processes with complex dynamics
especially when multiple effects are present. Here we demonstrate operando monitoring of the transition dynamics of a phase-change material via a self-referencing optofluidic microcavity. We use a pair of cavity modes to precisely decouple the refractive index and temperature information of the analyte during the phase-transition process. Through real-time measurements
we reveal the detailed hysteresis behaviors of refractive index during the irreversible phase transitions between hydrophilic and hydrophobic states. We further extract the phase-transition threshold by analyzing the steady-state refractive index change at various power levels. Our technology could be further extended to other materials and provide great opportunities for exploring on-demand dynamic biochemical processes.
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