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使用琼斯矩阵的方法推导了连续结构亚波长光栅的衍射方程,给出了光栅衍射效率表达式,对偏振特性与衍射特性进行了研究。发现连续结构亚波长光栅仅存在3个衍射级,总衍射效率为100%,且衍射效率可在衍射级间任意分配,0级的偏振态与入射光的偏振态相同,±1级衍射光偏振态与入射光无关,-1级为左旋圆偏振光,+1级为右旋圆偏振光。通过设置入射光偏振态与光栅相位延迟等参数,可使光栅具有闪耀特性,据此可用于设计高效偏振光分束器和偏振光开关。 相似文献
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Design of a Fused-Silica Subwavelength Polarizing Beam Splitter Grating Based on the Modal Method 下载免费PDF全文
A polarizing beam splitter (PBS) design based on a fused-silica lamellar subwavelength transmission grating is demonstrated with the modal method, where TE- and TM-polarized waves are mainly diffracted in the -1st and 0th orders, respectively. The physical explanation of the grating diffraction is illustrated by the interference of the corresponding parts of the two propagating modes, which is very similar to a Mach-Zehnder interferometer. It is shown that diffraction efficients over 99% for a TM-polarized wave in the -1st order and 90% for a TE-polarized wave in the 0th order are obtained at the wavelength of 1.053 μm. The polarization transmission extinction ratios are better than 33 dB and 51 dB for the order 0th and the -1st order, respectively. The splitting properties of the PBS grating designed by the modal method are in good agreement with the results simulated by the rigorous coupled wave analysis method. 相似文献
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酪氨酸酶在温和条件下能高效、高选择性实现单酚的邻位羟化以及氧化邻二酚为邻二醌.近来,模拟酪氨酸酶可逆键合、活化氧的研究非常活跃,已较为成功地设计合成了一些能够键合、活化氧、氧化基质和羟化芳烃的铜酶模型[1,2].本组曾报道若干咪唑化合物的合成,并成功构筑多种仿生体系用于分子识别及仿生催化[3~5].本文报道由N-烷化和Shiff碱反应以及通过酚偶联、溴甲基化、咪唑季铵化和碱存在下发生Hoffmann型消去反应的方法合成含多个咪唑和苯并咪唑的双核金属酶模型配体(1~3).合成路线如下: 相似文献
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Surface plasmon resonance (SPR) is obtained by exciting the surface plasmon (SP) at the metal and dielectric interface, which can greatly enhance the extraordinary optical transmission (EOT) through a nanoslit milled in the metal film. We present a structure with a 50-nm-wide silver nanoslit for EOT by coupling light into the dielectric interlayer between periodic strips and a metal film. When the period of the metallic strips is equal to the wavelength of the SPR, the transmission efficiency of 187.6 through the nanoslit is enhanced. The metallic strip width over the nanoslit is optimized to improve transmission efficiency, and the maximal efficiency of 204.3 is achieved. 相似文献
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