Fast and Low‐Power All‐Optical Tunable Fano Resonance in Plasmonic Microstructures
Fast and Low‐Power All‐Optical Tunable Fano Resonance in Plasmonic Microstructures
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DOI：
10.1002/adom.201200025
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发表时间：
2013-01
影响因子：
9
通讯作者：
Yu Zhu;Xiaoyong Hu;Yongyang Huang;Hong Yang;Q. Gong
中科院分区：
文献类型：
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作者：
Yu Zhu;Xiaoyong Hu;Yongyang Huang;Hong Yang;Q. Gong
近年来，等离子体微结构中的Fano共振（一种离散能态和连续态之间的干涉耦合）[ 1 ]由于其在集成光子电路、纳米光子学和生物传感器等领域的巨大应用潜力而引起了人们的极大关注。Fano共振的本质特征是在很窄的频率范围内，谱线形状不对称，透射谱、反射谱或消光谱发生剧烈变化。[ 2 ]已经提出了各种配置来证明等离子体微结构中的Fano共振，例如在电介质波导上使用金属光栅，[ 3-5 ]金属纳米线阵列，[6，7]金属异质二聚体或簇，[8，9]缺少楔形切片的金属纳米盘，[ 10 ]和光子超材料。[ 11-13 ]可调谐Fano共振，其中心波长随外界参数变化，在实际中有着更灵活和重要的应用。其基本思想是直接调整等离子体微结构的结构参数。[ 14-17 ] 2010年，Pryce等人报告了通过机械变形弹性体衬底以修改亚波长谐振元件之间的距离，在光子超材料中的Fano谐振波长中的400 nm偏移。[ 18 ]随后，Samson等人通过电调谐光子平面超材料中相邻硫属化物玻璃层的介电性质，实现了Fano谐振波长的150 nm偏移。[ 19 ]最近，Belotelov等人报道了磁等离子体晶体中的磁可调谐Fano共振。[ 20个]
IO N Recently, Fano resonance, an interference coupling between a discrete energy state and a continuum of states, [ 1 ] in plasmonic microstructures has attracted great attention because of its great potential applications in fi elds of integrated photonic circuits, nanophotonics, and biosensors. The essential characteristics of Fano resonance lie in the asymmetric line shape and a drastic change in transmission, refl ection or extinction spectrum over a very narrow frequency range. [ 2 ] Various confi gurations have been proposed to demonstrate Fano resonance in plasmonic microstructures, such as using metallic grating on dielectric waveguides, [ 3–5 ] metallic nanowire arrays, [ 6,7 ] metallic heterogeneous dimmers or clusters, [ 8,9 ] metallic nanodisks with a missing wedge-shaped slice, [ 10 ] and photonic metamaterials. [ 11–13 ] Tunable Fano resonance, the central wavelength of which varying with external parameters, can fi nd more fl exible and important applications in practice. The basic idea is to directly adjust the structural parameters of plasmonic microstructures. [ 14–17 ] In 2010, Pryce et al. reported a 400-nm shift in the Fano resonance wavelength in a photonic metamaterial by mechanically deforming the elastomeric substrate to modify the distance between subwavelength resonant elements. [ 18 ] Subsequently, Samson et al. achieved a 150-nm shift in the Fano resonance wavelength by electrically tuning the dielectric properties of an adjacent chalcogenide glass layer in a photonic planar metamaterial. [ 19 ] Recently, Belotelov et al. reported a magnetically tunable Fano resonance in a magneto-plasmonic crystal. [ 20 ]