Comparisons of Surface Plasmon Sensitivities in Periodic Gold Nanostructures
Comparisons of Surface Plasmon Sensitivities in Periodic Gold Nanostructures
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DOI：
10.1007/s11468-008-9065-z
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发表时间：
2008-12-01
期刊：
影响因子：
3
通讯作者：
Wei, Pei-Kuen
中科院分区：
文献类型：
--
作者：
Lee, Kuang-Li;Wang, Way-Seen;Wei, Pei-Kuen
比较了三种不同孔径尺寸的纳米结构（纳米缝、纳米孔和同心圆）在水环境中的波长灵敏度。这些纳米结构是在110 nm厚的金膜上制成的，周期为600 nm。这些纳米结构中的表面等离子体共振在相位匹配条件附近产生透射下降，而在较长波长处产生峰值。在波谷处测得的波长灵敏度接近理论预测，比在波峰处测得的波长灵敏度大约1.5倍。这种灵敏度的差异是由于各种表面等离子体分布，所示的时域有限差分计算。此外，灵敏度随孔径尺寸的增大而降低。纳米缝阵列和同心圆阵列由于无截止透射，比纳米孔阵列具有更好的灵敏度。
The wavelength sensitivities of three kinds of nanostructures (nanoslits, nanoholes, and concentric circles) with various aperture sizes were compared in water environment. These nanostructures were made on a 110-nm-thick gold film with a period of 600 nm. Surface plasmon resonances in these nanostructures produce transmission dips near the phase-matching conditions while peaks at longer wavelengths. The wavelength sensitivities measured at dips are close to theoretical predictions and about 1.5 times larger than those measured at peaks. Such sensitivity difference is attributed to various surface plasmon distributions, as illustrated by the finite-difference time-domain calculations. In addition, the sensitivity decreases with the increase of aperture size. The nanoslit array and concentric circles have better sensitivities than the nanohole array due to the no cut-off transmission.