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Gap plasmon waveguide with a stub: structure for a wavelength selective device

机译:带短管的间隙等离子体激元波导:用于波长选择装置的结构

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We have performed the three dimensional (3D) numerical analysis for a gap plasmon waveguide with two stubs in a silver film by using the 3D finite-difference time-domain (FDTD) method. The simulated transmittance shows that such the 3D structure works as a wavelength selective device with submicron size as already predicted in the 2D simulations. We have also fabricated such a structure on a glass substrate by using the focused ion beam method. The width of the gap is around 150 nm. The observed transmittance spectra of the structure have clearly indicated the wavelength dependence and agree well with those obtained by a numerical simulation. Our results show that the structure proposed by us is promising for a compact wavelength selective device.
机译:我们已经使用3D有限差分时域(FDTD)方法对银膜中具有两个短截线的间隙等离子体激元波导进行了三维(3D)数值分析。仿真的透射率表明,这种3D结构可作为波长选择设备使用,其尺寸已达到2D仿真所预测的亚微米尺寸。我们还通过使用聚焦离子束法在玻璃基板上制造了这种结构。间隙的宽度约为150nm。观察到的结构的透射光谱清楚地表明了波长依赖性,并且与通过数值模拟获得的光谱很好地吻合。我们的结果表明,我们提出的结构有望用于紧凑的波长选择器件。

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