Three different designs of plasmonic photonic crystal filters (two-channel, three-channel, and four-channel) are proposed and considered. The photonic crystal structures consist of standing rods made of Ag and GaAs, whereby introducing different simple or ring-shaped defects, two-, three-, or four-port filters are realized. Optical fluid is used instead of air as the background material, owing to its versatile benefits. By utilizing different combinations of optical fluids and plasmonic materials, multichannel filters are obtained which can function better by improving the structural parameters such as the rod’s radius. Considering the four-port filter, its applications as the power splitter are also investigated. For tuning the filter properties such as the resonance peak’s value and wavelength, impacts of Ag and GaAs rod radius on the transmission spectrum are examined. The following resonance peak’s value and FWHM are obtained for the proposed structures: two-channel filter (0.9, 4 nm), three-channel filter (0.8, 2 nm), four-channel filter (0.5, 10 nm). The proposed designed filters can be utilized in the photonic integrated circuits as well as the nanophotonics devices for medical and industrial applications.

中文翻译：

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可调谐环形等离子体光子晶体滤光片的光学流体渗透设计

提出并考虑了等离子体光子晶体滤波器的三种不同设计（双通道、三通道和四通道）。光子晶体结构由由 Ag 和 GaAs 制成的立柱组成，由此引入不同的简单或环形缺陷，实现了二端口、三端口或四端口滤波器。由于光学流体具有多种优点，因此使用光学流体代替空气作为背景材料。通过利用光学流体和等离子体材料的不同组合，获得了多通道滤波器，它可以通过改善杆的半径等结构参数来更好地发挥作用。考虑到四端口滤波器，还研究了它作为功率分配器的应用。用于调谐滤波器属性，例如共振峰的值和波长，检查了 Ag 和 GaAs 棒半径对透射光谱的影响。对于所提出的结构，获得了以下共振峰值和 FWHM：双通道滤波器 (0.9, 4 nm)、三通道滤波器 (0.8, 2 nm)、四通道滤波器 (0.5, 10 nm)。所提出的设计滤波器可用于光子集成电路以及用于医疗和工业应用的纳米光子学器件。