Gapped Surface Plasmon Polariton Waveguide Device Based on a Liquid Crystal

作者：Lee Dong Hun; Lee Myung Hyun^*

来源：Journal of Nanoscience and Nanotechnology, 2015, 15(10): 7711-7716.

DOI：10.1166/jnn.2015.11175

• Surface Plasmon Polariton
• Plasmonic Device
• Liquid Crystal
• Gapped Surface Plasmon Polariton Waveguides

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.

• 出版日期2015-10