Four-wave mixing can be used for all-optical wavelength conversion to manipulate communication channels in wavelength division multiplexing. Most wavelength conversion techniques rely on small intrinsic optical nonlinearities, leading to the low conversion efficiency and high energy usage while requiring a long light-matter interaction lengths. Here, we demonstrate a resonantly enhanced nonlinear process by introducing the vibrational excitation, where the electrostrictive force excites the acoustic modes of nanoparticles and induces a travelling periodic variation in refractive index of the sample. We show experimentally and theoretically strong nanoparticle resonances ranging from tens of GHz to THz, which can be utilized to achieve higher frequency conversion for fast all-optical data processing.
Dao Xiang and Reuven Gordon, "Nanoparticle electrostriction acoustic resonance enhanced nonlinearity," Proc. SPIE 9922, Optical Trapping and Optical Micromanipulation XIII, 992223 (Presented at SPIE Nanoscience + Engineering: September 01, 2016; Published: 16 September 2016); https://doi.org/10.1117/12.2235498.
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