12 September 2014 Third-harmonic generation enhancement in polymer-dispersed liquid crystal grating
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In this paper, the enhancement of third-harmonic generation in one-dimensional periodic grating structure with lowindex contrast, which is produced by holographic illuminated liquid crystal droplets and called polymer-dispersed liquid crystal grating, with near-infrared pumping has been demonstrated. The observed enhancement process is theoretically explained and modeled with a multi-scale perturbation analysis and split-step Fourier transform technique, respectively. We show that the third-harmonic generation has been enhanced by setting the fundamental frequency wavelength to the long-wavelength band-edge of the first photonic band-gap of this periodic structure and satisfying band-edge phasematched condition. The numerical results show that a dramatic enhancement of the third-harmonic field is observed near the long-wavelength band-edge of the second photonic band-gap. Furthermore, the conversion efficiency of thirdharmonic field of forward-propagating direction is more than of backward-propagating direction by a factor of 600.
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S. Wicharn, S. Wicharn, P. Buranasiri, P. Buranasiri, "Third-harmonic generation enhancement in polymer-dispersed liquid crystal grating", Proc. SPIE 9162, Active Photonic Materials VI, 916223 (12 September 2014); doi: 10.1117/12.2062481; https://doi.org/10.1117/12.2062481

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