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Homogenization of Sub-Wavelength Inhomogeneities for Analysis and Design of Terahertz Spoof Plasmonic Structures

Edalatipour, Masoud | 2015

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 48369 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mehrany, Khashayar
  7. Abstract:
  8. In this thesis we investigate the use of periodic array of metallic structures which mimics the propagation of the surface plasmon-polaritons waves. The TEM modes supported by these structured surfaces are referred to as the spoof surface plasmon-polaritons. They have many properties in common with the electron plasma and can be described by a plasma-like effective permittivity, when the structure is on a scale much smaller than the wavelength. In this thesis we extend this concept to include different kinds of structured surfaces like cut through metallic slits array and square array of rectangular metallic pillars which support TEM modes. We show that although these structured surfaces don’t support a plasma-like effective permittivity but they support the spoof surface plasmon-polaritons wave propagations on account of the dispersive behaviors. Also we show that artificial surface conductivity is created at the flat interface between the periodic structured surfaces and the cover/substrate. The presence of the surface conductivity when the periodic structure is modeled by an effective refractive index can describe how non-specular higher diffracted orders affect the specular zeroth diffracted order. The magnitude of this surface conductivity is controlled geometrically. Our extended model can be used to investigate the performance of the structured surfaces even at higher working frequencies when the sub-wavelength regime does not hold and also at non-normal incident angles. We show that by using our model different kinds of extra ordinary transmissions like Fano resonances and plasmonic Brewster angle transmissions can be predicted more exactly
  9. Keywords:
  10. Spoof Plasmonic Waves ; Surface Plasmon Polariton ; Fano Factor ; Anomalous Transport ; Brewster Angle ; Fano Resonances ; Effective Index

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