Numerical study on an asymmetric guided-mode resonant grating with a Kerr medium for optical switching.
Numerical study on an asymmetric guided-mode resonant grating with a Kerr medium for optical switching.
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DOI：
10.1364/josaa.22.000355
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发表时间：
2005-02
期刊：
影响因子：
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通讯作者：
A. Mizutani;H. Kikuta;K. Iwata
中科院分区：
文献类型：
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作者：
A. Mizutani;H. Kikuta;K. Iwata
采用非线性时域有限差分法（FDTD）模拟了克尔介质导模谐振光栅（GMRG）的光开关效应。提出了一种具有较大空间二次谐波分量的非对称波导光栅用于光开关。共振反射发生在两个带边波长处。这些波长用于泵浦光和探测光。泵浦光的增强电场由于克尔效应而改变探测光的谐振波长。我们设计了共振波长为1489.6和1630 nm的GMRG，分别用作泵浦光和探测光。当光栅材料具有8.5 × 10（-10）esu的三阶极化率chi（3）时，通过将泵浦光的强度从0增加到60 kW/mm 2，探测光的透射率从0变化到80%。
Optical switching effects of a guided-mode resonant grating (GMRG) with a Kerr medium have been simulated with the nonlinear finite differential time domain (FDTD) method. An asymmetric waveguide grating with a large second spatial harmonic component has been proposed for the optical switch. Resonant reflection occurs at both of the band-edge wavelengths. These wavelengths are used for the pump light and the probe light. The enhanced electric field of the pump light changes the resonant wavelength for the probe light as a result of the Kerr effect. We designed the GMRG with resonant wavelengths of 1489.6 and 1630 nm, which were used for the pump light and the probe light, respectively. When the grating material has a third-order susceptibility chi(3) of 8.5 x 10(-10) esu, the transmittance of the probe light changes from 0 to 80% by increasing the intensity of the pump light from 0 to 60 kW/mm2.