Plasmonic nanoantennas for enhanced light-matter interactions and graphene based tunable nanophotonic devices
Author
Çakmakyapan, Semih
Advisor
Özbay, Ekmel
Date
2015Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
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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 PlasmonsSubwavelength Localization
Metamaterial
Split Ring Resonator
Metallic Gratings
Plasmonic Lens
Raman Spectroscopy
Nanoantennas
Graphene