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Anomalous Reflection and Transmission in Resonant Magneto-Optic Structures

Pahlavan, Payman | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44376 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mehrany, Khashayar; Rajaei, Behzad
  7. Abstract:
  8. In this thesis, light transmission in dielectric slit arrays on metallic and magneto-optical material has been analyzed by mode matching method together with numerical simulations on commercial softwares such as Comsol Multiphysics and CST microwave studio. It has been shown that light transmission can be attributed to either the Fabry-Perot resonances or a collective resonance phenomenon across the array. In the first case, the transmission resonance is related to the slit depth and is confined to a single slit. In the second case; however, the resonant mechanism affects several neighboring slits. Surprisingly the former is converted to the latter by increasing the slit depth. Furthermore it has been shown that perfect metal can be replaced by magneto-optic materials if the working frequency range lies within an appropriate interval. By comparing the electromagnetic field patterns of slit modes in these structures, the similitude of these two structures has been demonstrated in this frequency regime. Similar results have been observed for magneto-optical structures. Despite the similarities, the external magnetic field dependence of the electric permittivity in magneto-optic materials can be used to manipulate the resonant frequencies in order to design a tunable bandpass optical filter
  9. Keywords:
  10. Electromagnetic Extraordinary Transmission ; Diffraction ; Magneto-Optic Materials ; Subwavelength Apertures ; Slit Array

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