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      • Dept. of Physics - Ph.D. / Sc.D.
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      Plasmonic nanoantennas for enhanced light-matter interactions and graphene based tunable nanophotonic devices

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      Author
      Çakmakyapan, Semih
      Advisor
      Özbay, Ekmel
      Date
      2015
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      Focusing, manipulating and beaming of electromagnetic waves are important for many applications such as antennas, optical isolators, biological sensor, chemical sensors, and solar cells. There is an extensive research about the manipulation of light, and its interaction with di erent types of materials including subwavelength structures. However, manipulating light at the nanoscale has many di culties due to the di raction limit. In this thesis, we mainly focus on the characterization and experiments of subwavelength plasmonic structures. We investigated the spatial distribution of the electric eld through subwavelength slits by using symmetric and non-symmetric periodic metallic grating structures in order to obtain one-way transmission, o -axis beaming, collimation and diode-like beaming. We also studied various plasmonic structures such as circular rings and fractal bowtie antennas. After combining them with Raman active molecules, we showed that these plasmonic structures can be used as e cient surface enhanced Raman spectroscopy substrates. Finally, we designed, fabricated and measured nanoantennas and split ring resonators on graphene in order to tune their optical response using the electrically controllable doping property of the graphene.
      Keywords
      Surface Plasmons
      Subwavelength Localization
      Metamaterial
      Split Ring Resonator
      Metallic Gratings
      Plasmonic Lens
      Raman Spectroscopy
      Nanoantennas
      Graphene
      Permalink
      http://hdl.handle.net/11693/16913
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      • Dept. of Physics - Ph.D. / Sc.D. 73
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