Çakmakyapan, Semih2016-01-082016-01-082015http://hdl.handle.net/11693/16913Ankara : The Department of Physics and the Graduate School of Engineering and Science of Bilkent University, 2015.Thesis (Ph. D.) -- Bilkent University, 2015.Includes bibliographical references leaves 88-102.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.xiv, 105 leaves, graphics, illustrationsEnglishinfo:eu-repo/semantics/openAccessSurface PlasmonsSubwavelength LocalizationMetamaterialSplit Ring ResonatorMetallic GratingsPlasmonic LensRaman SpectroscopyNanoantennasGrapheneQC176.8.P88 C35 2015Plasmans (Physics)Nanophotonics.Thesis