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Efficient second-harmonic generation by scattering from porous gallium phosphide |
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| Authors: | L A Golovan’ V A Mel’nikov S O Konorov A B Fedotov S A Gavrilov A M Zheltikov P K Kashkarov V Yu Timoshenko G I Petrov L Li V V Yakovlev |
| Institution: | (1) Physics Department, Moscow State University, Vorob’evy gory, Moscow, 119992, Russia;(2) Moscow State Institute of Electronic Technology, Moscow, 103498, Russia;(3) Physics Department, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA |
| Abstract: | We experimentally study second-harmonic generation by femtosecond Cr: forsterite-laser radiation scattered on the surface of porous gallium phosphide with characteristic pore sizes and distances between the pores comparable with the second-harmonic wavelength. The intensity of the second-harmonic signal from samples with initial crystallographic surface orientations (110) and (111) is more than an order of magnitude higher than the intensity of the second harmonic generated in reflection from single-crystal gallium phosphide. The efficiency of second-harmonic generation by macroporous gallium phosphide substantially increases as the pump wave-length becomes shorter. The influence of light localization and scattering effects on the enhancement of second-harmonic generation and polarization properties of the second-harmonic is discussed. |
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