Journal
LASER & PHOTONICS REVIEWS
Volume 8, Issue 4, Pages 562-568Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201300185
Keywords
Surface plasmon; waveguide; thin plasmonic surface; tunable bandgap; spectrum filter
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Funding
- Foundation for the Author of the China Scholarship Council (CSC)
- National Science Foundation of China for Excellent Young Scientists [61322504]
- National Excellent Doctoral Dissertation of China [201217]
- National Natural Science Foundation of China [11004147]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
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Transverse magnetic modes propagate freely for any frequency in a parallel plated waveguide. Here, it is shown that when two thin plasmonic materials are attached to the metal walls of the waveguide, a bandgap emerges due to the excited surface plasmon polaritons. As the plasmonic materials become thin enough, a critical thickness is observed. For any width larger than such a value, the bandgap is fixed, otherwise a tunable bandgap can be achieved (different widths induce different bandgaps). For application, such a tunable bandgap system can be utilized to design a band-stop filter for terahertz frequencies with a high quality factor.
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