From Event: SPIE Organic Photonics + Electronics, 2016
We studied the effects of two types of ultrasonic waves, shear waves and longitudinal waves, using two nonlinear optical techniques, second-harmonic generation and hyper-Rayleigh scattering. Since shear waves hardly propagate in liquids, their influence on molecules at the interface between a surface and a liquid was studied using second-harmonic generation. Longitudinal waves propagate easily in solution, thus we used hyper-Rayleigh scattering to probe the ultrasonic effects on chromophores in solution. While we did not find shear waves to alter the second-harmonic generation from chromophores at the liquid/surface interface, the longitudinal waves caused effects comparable to our earlier observations. Longitudinal ultrasound caused a strong intensity modulation of the nonlinear optical signal according to a wave-pattern.
Steven Deckers, Nick Van Steerteghem, Christ Glorieux, Thierry Verbiest, and Monique A. van der Veen, "Acoustic effects on nonlinear optical processes," Proc. SPIE 9939, Light Manipulating Organic Materials and Devices III, 99390F (Presented at SPIE Organic Photonics + Electronics: September 01, 2016; Published: 23 September 2016); https://doi.org/10.1117/12.2236958.
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