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Gapped Surface Plasmon Polariton Waveguide Device Based on a Liquid Crystal

机译:基于液晶的带隙表面等离子体激元极化波导装置

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We propose a gapped surface plasmon polariton waveguide (G-SPPW) device based on a liquid crystal (LC) at a wavelength of 1.55 mu m. The G-SPPW device is composed of an input 2.0-mu m-wide and 5.0-mu m-long insulator-metal-insulator waveguide (IMI-W), an 8-mu m-long gap, and an output 2.0-mu m-wide and 25.0-mu m-long IMI-W. The LC is used for the gap and the 5.15-mu m-thick upper and lower dielectric layers. The input surface plasmon polaritons (SPPs) propagate and jump over the gap in the G-SPPW with a coupling loss of less than similar to 0.68 dB. The propagation and coupling losses of the 38-mu m-long G-SPPW device are varied in the range of similar to 0.5268 dB to similar to 2.6716 dB and similar to 0.1446 dB to similar to 0.6784 dB, respectively, with LC tilt angles (theta(1,2)) = 0 degrees similar to 90 degrees at a fixed 90 degrees twist angle. The normalized transmission of the G-SPPW device is also varied in the range from -3.351 dB to -0.6714 dB with theta(1,2) = 0 degrees similar to 90 degrees at a fixed 90 degrees twist angle. The output SPP characteristics of the G-SPPW device can be properly controlled by the orientation of the LC molecules. The proposed G-SPPW device shows potential for new active plasmonic device applications.
机译:我们提出了一种基于液晶(LC),波长为1.55μm的带隙表面等离子体激元极化波导(G-SPPW)器件。 G-SPPW器件由一个输入宽度为2.0微米,长度为5.0微米的绝缘体-金属-绝缘体波导(IMI-W),一个8微米长的间隙和一个输出2.0微米组成米宽和25.0微米长的IMI-W。 LC用于间隙和厚度为5.15μm的上下介电层。输入表面等离振子极化子(SPP)传播并跳过G-SPPW中的间隙,其耦合损耗小于0.68 dB。 38微米长的G-SPPW器件的传播损耗和耦合损耗在LC倾斜角的范围内分别变化为近似0.5268 dB,近似2.6716 dB,近似0.1446 dB和近似0.6784 dB( theta(1,2))= 0度,类似于在固定90度扭转角下的90度。 G-SPPW设备的归一化传输范围也从-3.351 dB到-0.6714 dB,θ(1,2)= 0度,类似于在固定90度扭曲角下的90度。 G-SPPW器件的输出SPP特性可以通过LC分子的方向适当控制。拟议中的G-SPPW器件在新型有源等离子设备应用中显示出潜力。

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