Plasmonic Hybrid Cavity-Channel Structure for Tunable Narrow-Band Optical Absorption
Plasmonic Hybrid Cavity-Channel Structure for Tunable Narrow-Band Optical Absorption
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DOI：
10.1109/lpt.2014.2344011
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发表时间：
2014-10-01
影响因子：
2.6
通讯作者：
Delaunay, Jean-Jacques
中科院分区：
文献类型：
--
作者：
Ho, Ya-Lun;Lerondel, Gilles;Delaunay, Jean-Jacques
提出了一种由相邻的u形腔组成的混合等离子体结构，该结构由纳米通道分隔，用于光的可调谐和窄带选择。混合腔道结构实现了吸收共振，其带宽为1.5 nm，定义为半最大全宽度，并且在近红外和红外区域具有可调谐特性。混合结构共振源于u腔的水平表面等离子体模式与通道模式的耦合，通道模式维持了通道中稳定的表面等离子体，通道入口的反极使光集中，通道出口的节点使光限制。由于这种耦合，在保持通道参数不变的情况下，通过改变u型腔的几何参数，可以很容易地调节尖锐而强烈的吸收共振。
A hybrid plasmonic structure consisting of adjacent U-shaped cavities separated by a nanochannel is proposed for tunable and narrow-band selection of light. The hybrid cavity-channel structure achieves absorption resonance with a bandwidth, defined as the full-width at half-maximum, of 1.5 nm and tunable property in the near-infrared and infrared regions. The hybrid structure resonance originates in the coupling of horizontal surface plasmon mode of the U-cavity with channel mode, which sustains stationary-surface-plasmons in the channel with antinodes at the channel entrances enabling light concentration and nodes at the channel exits enabling light confinement. As a result of the coupling, a sharp and strong absorption resonance is readily adjustable by varying the geometrical parameters of the U-cavity while keeping the channel parameters unchanged.