Design of compact optical devices based on periodic meta-structures
Author(s)
Advisor
Özbay, EkmelDate
2013Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
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Abstract
Manipulation of the flow of light is demanded for several applications such as
communication, data storage, sensor, photovoltaic cells, microscopy, lasers and
light emitting diodes for the purpose of designing compact, high-throughput and
high efficiency optical devices. Nevertheless, the control of the propagation of the
light becomes much harder in devices with smaller geometries mostly because of
diffractions, loss mechanisms and fabrication difficulties. Furthermore, materials
that are already available in the nature do not provide unprecedented optical
properties for nanoscale optical applications. Due to this fact that fabrication of
artificial materials is needed for utilizing novel and intriguing optical devices. For
this purpose, some relatively new research fields have emerged like photonic crystals,
metamaterials and high contrast gratings. We propose several designs based
on aforementioned meta-structures to achieve compact and practically realizable
optical devices. We presented compact optical demultiplexer, diode-like device
and electro-optic modulator designs that are based on photonic crystals. We also
proposed two circular polarizer designs based on metamaterials and high contrast
gratings. Further, we investigated unidirectional transmission and polarization
manipulation properties in chiral metamaterials. For most of the proposed designs,
we also experimentally verified the numerical and theoretical findings. In
conclusion, we can claim that the utilization of artifically structured materials
give opportunity to realize the control of light much more easily in nanoscale
designs.
Keywords
Photonic CrystalsMetamaterials
High Contrast Gratings
Slow Light,
Optical Demultiplexing
Asymmetric Transmission
Circular Polarization