Enhancement of two-photon absorption in anisotropic mesoporous silicon
Enhancement of two-photon absorption in anisotropic mesoporous silicon
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DOI：
10.1002/lapl.200810080
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发表时间：
2008-12-01
影响因子：
1.7
通讯作者：
Li, C. F.
中科院分区：
文献类型：
--
作者：
Gayvoronsky, V. Ya.;Kopylovsky, M. A.;Li, C. F.
In experiments on nonlinear-optical transmission of picosecond laser pulses at the wavelength of 1.064 mu m three-order-of-magnitude enhancement of the photoinduced absorption in optically anisotropic mesoporous silicon films compared to crystalline silicon (c-Si) was found. The effect is not sensitive to the polarization of the laser radiation and it saturates at laser peak intensities about 5 MW/cm(2). Higher laser intensity results in the polarization-sensitive photoinduced absorption, which is merely one-order-of-magnitude more effective than in c-Si. These efficient nonlinear-optical responses can be attributed to the resonant excitation of the defect states in the direct gap of silicon and local-field enhancement in the mesoporous films.[GRAPHICS]Total transmittance of the birefringent mesoporous silicon film versus the laser intensity for the sample of 49% porosity. The crystallographic direction [001] corresponds to the optical axis
