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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Roles and Contributions of Surface Plasmons, Evanescent Modes and Propagation Modes for Near-Field Enhancement of Nano-Slit
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Roles and Contributions of Surface Plasmons, Evanescent Modes and Propagation Modes for Near-Field Enhancement of Nano-Slit

机译：表面等离激元，E逝模式和传播模式在纳米狭缝近场增强中的作用和贡献

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摘要

The guided surface plasmons mode inside the slit of noble metals and its short-pitch resonance are predicted with waveguide theory and verified by finite difference time domain (FDTD). Additionally, surface plasmons modes inside the slit of noble metals, propagation modes inside normal planar waveguide and evanescent-like modes inside the planar waveguides formed with strong absorbing materials are proved unifiable. The short-pitch resonances inside the metal slit is proved to be the result of high effective refractive index of the propagating surface plasmon mode inside the slit when the slit width reduces to several dozens of nanometers. The roles and contributions of the each kind of mode to the near-field enhancement at the immediate exit of the slit are analyzed theoretically and with FDTD through specially designed structures. The near-field enhancement is proved originating from the guided surface plasmon mode in the metal slit other than the surface plasmon modes along the incident and exit surfaces.
机译：利用波导理论预测了贵金属狭缝内部的引导表面等离子体激元模式及其短节距共振，并通过时域有限差分法（FDTD）对其进行了验证。此外，事实证明，贵金属缝隙内的表面等离子体激元模，普通平面波导内的传播模和由强吸收材料形成的平面波导内的e逝样模是无法确定的。金属狭缝内部的短节距共振被证明是当狭缝宽度减小到几十纳米时，狭缝内部传播表面等离子体激元模的高有效折射率的结果。从理论上分析了各种模式对狭缝直接出口处近场增强的作用和贡献，并通过特殊设计的结构通过FDTD进行了分析。证明了近场增强起因于金属缝隙中的引导表面等离子体激元模式，而不是沿着入射和出射表面的表面等离子体激元模式。

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