Plasmonic wave propagation in silver nanowires: guiding modes or not?
Plasmonic wave propagation in silver nanowires: guiding modes or not?
复制标题
银纳米线中的等离子体波传播：引导模式与否？
DOI：
10.1364/oe.21.008587
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发表时间：
2013-04-08
期刊：
影响因子：
3.8
通讯作者：
Qiu, Min
中科院分区：
文献类型：
--
作者：
Li, Qiang;Qiu, Min
研究了一维银纳米线表面等离子体激元(SPP)光波导的传输模式和单导模条件与工作波长(500-2000 nm)的关系。对于浸泡在SiO(2)基质中的银纳米线，短程类SPP(SRSPP)模和长程类SPP(LRSPP)模都可以被引导。然而，只有类LRSPP模具有截止半径。对于SiO(2)衬底上的银纳米线，由于不对称性，类LRSPP模式不能被支持。而对于类SRSPP导模，当波长大于615 nm时，它有一个截止半径。当波长小于615 nm时，由于界面模的出现，导模没有截止半径，因此总能满足单导模工作的要求。
Propagation modes and single-guiding-mode conditions of one-dimensional silver nanowires based surface plasmon polariton (SPP) waveguides versus the operating wavelength (500-2000 nm) are investigated. For silver nanowires immersed in a SiO(2) matrix, both short-range SPP (SRSPP)-like modes and long-range SPP (LRSPP)-like modes can be guided. However, only the LRSPP-like modes have cutoff radii. For silver nanowires on a SiO(2) substrate, the LRSPP-like modes cannot be supported due to asymmetry. While for the SRSPP-like guiding mode, it has a cutoff radius for wavelength longer than 615 nm. For wavelength shorter than 615 nm, there is no cutoff radius for the guiding modes due to the appearance of the interface modes and thus the single-guiding-mode operation is always satisfied.