Gapped Surface Plasmon Polariton Waveguide Device Based on a Liquid Crystal.
Gapped Surface Plasmon Polariton Waveguide Device Based on a Liquid Crystal.
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DOI：
10.1166/jnn.2015.11175
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发表时间：
2015-10
影响因子：
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通讯作者：
Dong Hun Lee;Myung-Hyun Lee
中科院分区：
文献类型：
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作者：
Dong Hun Lee;Myung-Hyun Lee
提出了一种基于液晶（LC）的1.55 μm波长间隙表面等离子体极化子波导（G-SPPW）器件。G-SPPW器件由输入端2.0 μm宽、5.0 μm长的绝缘子-金属-绝缘子波导（IMI-W）、8 μm长的间隙和输出端2.0 μm宽、25.0 μm长的IMI-W组成。LC用于间隙和5.15 μm厚的上下介电层。输入表面等离子激元（SPPs）以小于~0.68 dB的耦合损失传播并跃过G-SPPW的间隙。38 μm长G-SPPW器件的传输损耗和耦合损耗分别在~0.5268 ~ ~2.6716 dB和~0.1446 ~ ~0.6784 dB范围内变化，在固定的90°扭转角下，LC倾角(θ1,2) = 0°~90°。在固定的90°扭角下，当θ1,2 = 0°~90°时，G-SPPW器件的归一化传输在-3.351 dB ~ -0.6714 dB范围内变化。G-SPPW器件的输出SPP特性可以通过LC分子的取向来控制。所提出的G-SPPW器件显示出新的有源等离子体器件应用的潜力。
We propose a gapped surface plasmon polariton waveguide (G-SPPW) device based on a liquid crystal (LC) at a wavelength of 1.55 μm. The G-SPPW device is composed of an input 2.0-μm-wide and 5.0-μm-long insulator-metal-insulator waveguide (IMI-W), an 8-μm-long gap, and an output 2.0-μm-wide and 25.0-μm-long IMI-W. The LC is used for the gap and the 5.15-μm-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 ~0.68 dB. The propagation and coupling losses of the 38-μm-long G-SPPW device are varied in the range of ~0.5268 dB to ~2.6716 dB and ~0.1446 dB to ~0.6784 dB, respectively, with LC tilt angles (θ1,2) = 0°~90° at a fixed 90° 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 θ1,2 = 0°~90° at a fixed 90° 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.