Transmission resonances of compound metallic gratings with two subwavelength slits in each period.
Transmission resonances of compound metallic gratings with two subwavelength slits in each period.
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DOI：
10.1364/oe.19.002187
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发表时间：
2011-01
期刊：
影响因子：
3.8
通讯作者：
Dong Xiang;Ling-Ling Wang-Ling;Xiao-Fei Li;Liu Wang;Xiang Zhai;Zhongkai Liu;Weiwei Zhao
中科院分区：
文献类型：
--
作者：
Dong Xiang;Ling-Ling Wang-Ling;Xiao-Fei Li;Liu Wang;Xiang Zhai;Zhongkai Liu;Weiwei Zhao
基于时域有限差分法，研究了在可见光和近红外波段内，两个亚波长狭缝内填充不同数量的光子晶体的复合金属光栅的透射共振特性.结果表明，除了在某个共振波长处具有透射特征外，透射谱几乎是两个相应简单光栅的透射谱的复合，其中两个狭缝内都发现了类法布里-佩罗（FP）现象，但类FP模式的阶数不同。如果一个狭缝内的类FP模式的阶数比另一个狭缝内的大，则透射的强度将显著减弱。我们把这种现象归因于相位共振，因为两个狭缝出口处的相位是相反的。
Based on the finite-difference time-domain method, we investigate the transmission resonances of compound metallic gratings with two subwavelength slits filled with different dielectrics inside each period in the visible and near infrared regions. The results show that the transmission spectrum is almost a compound of that of two corresponding simple gratings expect for the transmission feature at a certain resonant wavelength, where the Fabry-Pérot (FP)-like phenomena have been found both inside the two slits, but the orders of the FP-like modes are different. If the order of the FP-like mode inside one slit is one bigger than inside the other, the intensity of the transmission will be significantly weakened. We attribute this phenomenon to the phase resonance because the phases at the exits of the two slits are opposite to each other.