Array of subwavelength rectangular structures in palladium for optical hydrogen detection
Array of subwavelength rectangular structures in palladium for optical hydrogen detection
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用于光学氢检测的钯亚波长矩形结构阵列
DOI：
10.1117/12.907509
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
et al
中科院分区：
文献类型：
--
作者：
Etsuo Maeda;Jean-Jacques Delaunay;et al
为了改善亚波长结构对氢 (H2) 的光学检测，提出了亚波长钯 (Pd) 结构远场透射率的计算研究。在之前的报告中，使用亚波长孔阵列的远场透射光谱的光学响应来检测氢暴露时形成的氢化钯。氢化物形成后，亚波长钯孔阵列的主透射率峰的波长显示出向更长波长的转变。在本报告中，比较了亚波长钯孔阵列和棒阵列在 H2 暴露下的透射光谱的模拟光学响应。我们的计算研究表明，在 H2 暴露下，棒阵列的倾角波长比孔阵列的峰值波长有更大的偏移。棒状阵列的大光学响应的原因在于暴露于 H2 时 Pd 层的膨胀效应，导致棒状阵列向更长波长的较大偏移。棒状阵列具有增加 Pd 亚波长结构对 H2 暴露的光学响应的潜在优势。
A computational study of the far field transmittance of subwavelength palladium (Pd) structures is presented with a view of improving optical detection of hydrogen (H2) with subwavelength structures. In previous reports, the optical responses of the far field transmittance spectra with subwavelength hole arrays were used to detect Pd hydride which are formed upon hydrogen exposure. Upon hydride formation, the wavelength of the main transmittance peak of the subwavelength Pd hole arrays showed a shift to longer wavelengths. In this report, the simulated optical response of transmittance spectra upon H2exposure with the subwavelength Pd hole array and rod array were compared. Our computational studies show that the dip wavelength of rod arrays have larger shifts than that of the peak wavelength of hole arrays upon H2exposure. The reason of the large optical response of the rod arrays lies in the effect of the expansion of the Pd layer upon H2exposure that results in larger shift to longer wavelengths for the rod arrays. The rod arrays offer potential advantages to increase the optical response to H2exposure of Pd subwavelength structures.