Giant optical second-harmonic generation in single and coupled microcavities formed from one-dimensional photonic crystals
Giant optical second-harmonic generation in single and coupled microcavities formed from one-dimensional photonic crystals
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DOI：
10.1364/josab.19.002129
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发表时间：
2002-09-01
影响因子：
1.9
通讯作者：
Nakabayashi, S
中科院分区：
文献类型：
--
作者：
Dolgova, TV;Maidykovski, AI;Nakabayashi, S
通过二次谐波发生（SHG）光谱在频域和波矢量域中对一维全固态光子晶体微腔（MC）的非线性光学特性进行了实验研究。研究的单层和耦合MCs是由不同孔隙率的介孔硅层交替形成的。当基波辐射与 MC 模式共振时，二次谐波强度增强约 10(2) 倍。将谐振 SHG 响应与非谐振响应进行比较，因为基波波长位于光子带隙之外。在增强型 SHG 的波矢量域谱中观察到两个相同耦合 MC 的模式分裂。 SHG 增强归因于 MC 间隔中基本场的空间局域化和相位匹配条件的满足的综合效应。通过扫描近场光学显微镜直接在 MC 解理处探测共振基本场的限制。与 MC 模式光谱附近的巨大有效色散相关的相位匹配的作用是通过与光子带隙两个边缘处的 SHG 峰值的比较推导出来的。 (C) 2002 年美国光学学会。
The nonlinear optical properties of one-dimensional all-solid-state photonic-crystal microcavities (MCs) are experimentally studied by second-harmonic generation (SHG) spectroscopy in both the frequency and the wave-vector domains. The studied single and coupled MCs are formed by the alternating of mesoporous silicon layers of different porosities. When the fundamental radiation is in resonance with the MC mode the second-harmonic intensity is enhanced by a factor of approximately 10(2). The resonant SHG response is compared with the off-resonance response, as the fundamental wavelength is outside the photonic bandgap. The splitting of the modes of two identical coupled MCs is observed in the wave-vector domain spectrum of enhanced SHG. The SHG enhancement is attributed to the combined effects of the spatial localization of the fundamental field in the MC spacer and the fulfillment of the phase-matching conditions. The confinement of the resonant fundamental field is probed directly at the MC cleavage by a scanning near-field optical microscope. The role of the phase matching that is associated with the giant effective dispersion in the spectral vicinity of the MC mode is deduced from a comparison with the SHG peaks at both edges of the photonic bandgap. (C) 2002 Optical Society of America.