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      • Theses - Department of Physics
      • Dept. of Physics - Ph.D. / Sc.D.
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      Light matter interaction in plexcitonic crystals and moiré cavities

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      Embargo Lift Date: 2017-01-27
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      Author
      Karademir, Ertuğrul
      Advisor
      Aydınlı, Atilla
      Date
      2015-01
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      Surface plasmon polaritons (SPPs) are quanta of electromagnetic excitations at the interface between metal and dielectric media. SPPs with an evanescent tail in the perpendicular direction, thus their properties are sensitive to variations in the optical properties of the dielectrics film. If SPPs are created near excitonic media, coupling between excitons and SPs can be achieved. In this thesis, interaction dynamics of SPP-exciton coupling is investigated. In weak coupling case, properties of SPPs and excitons are perturbed as the enhancement of the optical absorption in excitonic matrices. In the strong coupling, coupled pairs (plexcitons) causes Rabi splitting in SPP dispersion curves. By patterning the metal-dielectric interface with sine profile grating, it is possible to form a band gap on the dispersion curve, width of which can be tuned by the groove depth and SPP-Exciton coupling can be engineered. Using this, a new type of crystal, plexcitonic crystal, is proposed and demonstrated that exhibit directional dependent coupling on square and triangular lattices. Superposing an additional grating on the initial one but with a slight difference in pitch, results in Moir e cavities, in which, slow plasmon modes can be confined. We show that we can directly image these modes using dark field microscopy. Further, the slow cavity mode in contact with an excitonic source, where SPPs are coupled with near field coupling, results in ampliffed light signal. Various Moire cavities are shown to exhibit plasmonic lasing when slow plasmon modes in Ag coated cavities are excited inside a suitable gain medium.
      Keywords
      Surface plasmon polaritons
      Excitons
      Light matter interaction
      Plexcitonic crystals
      Moire cavities
      Plasmonic lasers
      Permalink
      http://hdl.handle.net/11693/29065
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      • Dept. of Physics - Ph.D. / Sc.D. 73
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