Asymmetric band-pass plasmonic nanodisk filter with mode inhibition and spectrally splitting capabilities.
Asymmetric band-pass plasmonic nanodisk filter with mode inhibition and spectrally splitting capabilities.
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DOI：
10.1364/oe.22.009912
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发表时间：
2014-04
期刊：
影响因子：
3.8
通讯作者：
Guangzhi Zhan;Ruisheng Liang;Haitao Liang;Jie Luo;Rui-Tong Zhao
中科院分区：
文献类型：
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作者：
Guangzhi Zhan;Ruisheng Liang;Haitao Liang;Jie Luo;Rui-Tong Zhao
提出了一种基于金属-绝缘体-金属（MIM）纳米盘腔的紧凑型波长带通滤波器，并采用时域有限差分法（FDTD）进行了数值模拟。结果表明，通过改变纳米盘的半径和纳米盘与波导的耦合距离等几何参数，可以很容易地调节滤波器的传输特性。通过延长输入/输出波导的长度，该滤波器表现出谐振模抑制功能。利用这一特性，设计了一种双端口波长解复用器，它可以分离出纳米盘内部的谐振模，且透过率高达70%。波导滤波器可能成为高集成度光路器件设计的潜在应用。
A compact wavelength band-pass filter based on metal-insulator-metal (MIM) nanodisk cavity is proposed and numerically investigated by using Finite-Difference Time-Domain (FDTD) simulations. It is found that the transmission characteristics of the filter can be easily adjusted by changing the geometrical parameters of the radius of the nanodisk and coupling distance between the nanodisk and waveguide. By extending the length of input/output waveguides, the filter shows the resonant mode inhibition function. Basing on this characteristic, a two-port wavelength demultiplexer is designed, which can separate resonant modes inside the nanodisk with high transmission up to 70%. The waveguide filter may become a potential application for the design of devices in highly integrated optical circuits.