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Title: Super Subwavelength Guiding and Rejecting of Terahertz Spoof SPPs Enabled by Planar Plasmonic Waveguides and Notch Filters Based on Spiral-Shaped Units

Abstract

In this study, we numerically simulate novel planar plasmonic waveguides and notch filters with excellent guiding and rejection of terahertz (THz) waves with super subwavelength confinement. Our design is based on spoof surface plasmon polaritons-surface plasmon polaritons with a frequency that has been tuned using patterned conductive surfaces. We find that by using patterns of periodically arranged spiral-shaped units, the dispersion characteristics can be engineered at will by tuning the parameters of the spirals. We find that the resulting plasmonic waveguides have much lower asymptotic frequencies and much tighter terahertz field confinement when compared with conventional rectangular-grooved plasmonic waveguides. We show it is possible to design a structure with lateral dimensions that are only 25% the size of the conventional spoof surface plasmon polariton waveguides but with the same asymptotic frequency. Finally, we combined this architecture with broadband couplers to design an ultrawideband low-pass filter with sharp roll-off (cut-off frequency at 1.29 THz) and low insertion loss (<;3 dB). Furthermore, by introducing double ring resonators based on spiral-shaped units, a planar plasmonic notch filter with rejection of more than 17 dB between 0.97 and 0.99 THz is demonstrated. Finally, the proposed waveguides and notch filters may have great potential applicationsmore » in the promising terahertz integrated plasmonic circuits and systems.« less

Authors:
ORCiD logo [1];  [1];  [2]; ORCiD logo [1];  [1];  [1]; ORCiD logo [3]
  1. Xiamen University (China)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Duke Univ., Durham, NC (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1490460
Grant/Contract Number:  
AC02-76SF00515; 61601393; 11604276; 201887656; 2016J01321; 2015A030310009
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Lightwave Technology
Additional Journal Information:
Journal Volume: 36; Journal Issue: 20; Journal ID: ISSN 0733-8724
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 47 OTHER INSTRUMENTATION; Integrated optics devices; notch filters; spoof surface plasmon polaritons; terahertz (THz); waveguides

Citation Formats

Ye, Longfang, Zhang, Wei, Ofori-Okai, Benjamin K., Li, Weiwen, Zhuo, Jianliang, Cai, Guoxiong, and Liu, Qing Huo. Super Subwavelength Guiding and Rejecting of Terahertz Spoof SPPs Enabled by Planar Plasmonic Waveguides and Notch Filters Based on Spiral-Shaped Units. United States: N. p., 2018. Web. doi:10.1109/jlt.2018.2868129.
Ye, Longfang, Zhang, Wei, Ofori-Okai, Benjamin K., Li, Weiwen, Zhuo, Jianliang, Cai, Guoxiong, & Liu, Qing Huo. Super Subwavelength Guiding and Rejecting of Terahertz Spoof SPPs Enabled by Planar Plasmonic Waveguides and Notch Filters Based on Spiral-Shaped Units. United States. doi:10.1109/jlt.2018.2868129.
Ye, Longfang, Zhang, Wei, Ofori-Okai, Benjamin K., Li, Weiwen, Zhuo, Jianliang, Cai, Guoxiong, and Liu, Qing Huo. Fri . "Super Subwavelength Guiding and Rejecting of Terahertz Spoof SPPs Enabled by Planar Plasmonic Waveguides and Notch Filters Based on Spiral-Shaped Units". United States. doi:10.1109/jlt.2018.2868129. https://www.osti.gov/servlets/purl/1490460.
@article{osti_1490460,
title = {Super Subwavelength Guiding and Rejecting of Terahertz Spoof SPPs Enabled by Planar Plasmonic Waveguides and Notch Filters Based on Spiral-Shaped Units},
author = {Ye, Longfang and Zhang, Wei and Ofori-Okai, Benjamin K. and Li, Weiwen and Zhuo, Jianliang and Cai, Guoxiong and Liu, Qing Huo},
abstractNote = {In this study, we numerically simulate novel planar plasmonic waveguides and notch filters with excellent guiding and rejection of terahertz (THz) waves with super subwavelength confinement. Our design is based on spoof surface plasmon polaritons-surface plasmon polaritons with a frequency that has been tuned using patterned conductive surfaces. We find that by using patterns of periodically arranged spiral-shaped units, the dispersion characteristics can be engineered at will by tuning the parameters of the spirals. We find that the resulting plasmonic waveguides have much lower asymptotic frequencies and much tighter terahertz field confinement when compared with conventional rectangular-grooved plasmonic waveguides. We show it is possible to design a structure with lateral dimensions that are only 25% the size of the conventional spoof surface plasmon polariton waveguides but with the same asymptotic frequency. Finally, we combined this architecture with broadband couplers to design an ultrawideband low-pass filter with sharp roll-off (cut-off frequency at 1.29 THz) and low insertion loss (<;3 dB). Furthermore, by introducing double ring resonators based on spiral-shaped units, a planar plasmonic notch filter with rejection of more than 17 dB between 0.97 and 0.99 THz is demonstrated. Finally, the proposed waveguides and notch filters may have great potential applications in the promising terahertz integrated plasmonic circuits and systems.},
doi = {10.1109/jlt.2018.2868129},
journal = {Journal of Lightwave Technology},
number = 20,
volume = 36,
place = {United States},
year = {2018},
month = {8}
}

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