scholarly journals Spatially Broadband Coupled-Surface Plasmon Wave Assisted Transmission Effect in Azo-Dye-Doped Liquid Crystal Cell

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1357
Author(s):  
Guan-Ting Dong ◽  
Chun-Ta Wang ◽  
Yu-Ju Hung
Keyword(s):  
Liquid Crystal ◽  
Surface Plasmon ◽  
Azo Dye ◽  
Surface Plasmon Polariton ◽  
Mie Scattering ◽  
Aluminum Film ◽  
Liquid Crystal Cell ◽  
Metallic Surface ◽  
Crystal Cell ◽  
Plasmon Polariton

Active tuning on a plasmonic structure is discussed in this report. We examined the transient transmission effects of an azo-dye-doped liquid crystal cell on a metallic surface grating. The transition between isotropic and nematic phases in liquid crystal generated micro-domains was shown to induce the dynamic scattering of light from a He-Ne laser, thereby allowing transmission through a non-transparent aluminum film overlaying a dielectric grating. Various grating pitches were tested in terms of transmission effects. The patterned gratings include stripe ones and circular forms. Our results indicate that surface plasmon polariton waves are involved in the transmission process. We also demonstrated how momentum diagrams of gratings and Surface Plasmon Polariton (SPP) modes combined with Mie scattering effects could explain the broadband coupling phenomenon. This noteworthy transition process could be applied to the development of spatially broadband surface plasmon polariton coupling devices.

Gapped Surface Plasmon Polariton Waveguide Device Based on a Liquid Crystal

2015 ◽  
Vol 15 (10) ◽  
pp. 7711-7716 ◽  
Author(s):  
Dong Hun Lee ◽  
Myung-Hyun Lee
Keyword(s):  
Liquid Crystal ◽  
Surface Plasmon ◽  
Surface Plasmon Polariton ◽  
Twist Angle ◽  
Coupling Loss ◽  
Metal Insulator ◽  
Input Surface ◽  
Device Applications ◽  
Plasmon Polariton ◽  
Plasmon Polaritons

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 (1, 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 1, 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.

Liquid crystal-based dielectric loaded surface plasmon polariton optical switches

2011 ◽  
Vol 110 (9) ◽  
pp. 093102 ◽  
Author(s):  
A. C. Tasolamprou ◽  
D. C. Zografopoulos ◽  
E. E. Kriezis
Keyword(s):  
Liquid Crystal ◽  
Surface Plasmon ◽  
Surface Plasmon Polariton ◽  
Optical Switches ◽  
Loaded Surface ◽  
Plasmon Polariton

Generation of optical vortices using a uniaxially aligned azo-dye-doped liquid crystal cell and space-variant polarization projection system

2019 ◽  
Vol 58 (26) ◽  
pp. 7145
Author(s):  
Moritsugu Sakamoto ◽  
Satoru Kaneko ◽  
Kohei Noda ◽  
Tomoyuki Sasaki ◽  
Nobuhiro Kawatsuki ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Azo Dye ◽  
Liquid Crystal Cell ◽  
Optical Vortices ◽  
Projection System ◽  
Crystal Cell ◽  
Space Variant

Measurement of Surface Plasmon Polariton Enhanced Goos–Hanchen Shift Based on Grating and Liquid Crystal Technologies

2011 ◽  
Vol 23 (23) ◽  
pp. 1829-1831 ◽  
Author(s):  
Zhang-di Huang ◽  
Su-shan Li ◽  
Zi-jian Wu ◽  
Fei Xu ◽  
Wei Hu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Surface Plasmon ◽  
Surface Plasmon Polariton ◽  
Plasmon Polariton
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