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Observation and Analysis of Blinking Surface-enhanced Raman Scattering
Published on: January 11, 2018
Multi-order stimulated Raman scattering in colliding droplets
Ruiji Kataoka1, Kenichi Okutsu1, Jun-Ya Kohno1
1Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan.
The Journal of Chemical Physics
|August 12, 2026
Summary
Stimulated Raman scattering (SRS) in liquid droplets shows delayed generation, with later orders building on earlier ones. Colliding droplets offer faster, more efficient SRS generation compared to single droplets.
Area of Science:
- Nonlinear optics
- Cavity optomechanics
- Spectroscopy
Background:
- Liquid droplets act as high-Q optical cavities supporting whispering-gallery modes.
- These cavities enhance nonlinear optical processes like stimulated Raman scattering (SRS).
- Understanding the temporal dynamics of multi-order SRS is crucial for optimizing such systems.
Purpose of the Study:
- To investigate the temporal dynamics of multi-order SRS in single and colliding carbon tetrachloride droplets.
- To elucidate the sequential buildup process of SRS orders.
- To compare the efficiency and generation time of SRS in single versus colliding droplets.
Main Methods:
- Utilized a 532 nm pulsed laser for excitation.
- Performed a comprehensive shot-to-shot analysis of over 10^3 SRS waveforms.
- Employed a numerical multi-order SRS generation model to fit experimental data.
Main Results:
- Observed a 10-20 ns delay in multi-order SRS generation in single droplets relative to the laser pulse.
- Identified a sequential buildup where lower-order SRS pumps higher-order SRS.
- Colliding droplets showed significantly shorter SRS generation times and higher efficiency than single droplets.
- Determined Q factors of ~3x10^7 for single droplets and ~5x10^6 for colliding droplets.
Conclusions:
- The temporal delay in single droplets is attributed to a sequential pumping mechanism.
- Colliding droplets exhibit enhanced efficiency due to a lower Q factor and improved field coupling.
- Colliding droplets serve as efficient, tunable cavities for advanced spectroscopy and interface analysis.
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