Advisors
Now showing items 1-20 of 61
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A1GaN UV photodetectors : from micro to nano
(Bilkent University, 2011)The absorption edge of AlGaN based alloys can be tuned from deep UV to near UV by changing the composition. This enables the use of the material in various technological applications such as military, environmental ... -
Adaptive metasurface designs for thermal camouflage, radiative cooling, and photodetector applications
(Bilkent University, 2022-01)Metamaterials, described as artificial sub-wavelength nanostructures, refer to a class of manufactured materials that possess distinctive electromagnetic features which cannot be found with natural materials. Thermal ... -
AlxGa1-xN based solar blind Schottky photodiodes
(Bilkent University, 2004)Photodetectors are essential components of optoelectronic integrated circuits and fiber optic communication systems. AlxGa1−xN is a promising material for optoelectronics and electronics. Applications include blue and ... -
Beaming and localization of electromagnetic waves in periodic structures
(Bilkent University, 2010)We want to manipulate light for several applications: microscopy, data storage, leds, lasers, modulators, sensor and solarcells to make our life healthier, easier or more comfortable. However, especially in small scales ... -
Broadband GaN LNA MMIC development with the micro/nano process development by kink-effect in S22 consideration
(Bilkent University, 2021-01)Broadband low noise amplifiers (LNA) are one of the key components of the nu-merous applications such as communication, electronic warfare, and radar. The requirements for higher bandwidth, higher speed, higher survivability, ... -
Characterization and applications of negative-index metamaterials
(Bilkent University, 2008)Metamaterials offer novel electromagnetic properties and promising applications including negative refraction, flat-lenses, superlenses, cloaking devices. In this thesis, we characterized the negative-index metamaterials ... -
Characterization of photonic crystals at microwave frequencies
(Bilkent University, 1996)VVe investigated the surface reflection properties of layer-by-layer photonic crystals, for dielectric and metallic based photonic crystals. By using a FabryPerot cavity analogy with the reflection-phase information of ... -
Chiral metamaterial and high-contrast grating based polarization selective devices
(Bilkent University, 2013)The utilization of purposely designed artificial media with engineered electromagnetic responses enables the obtaining of intriguing features that are either impossible or difficult to realize using readily available ... -
Color generation and enhancement using large-scale compatible metamaterial design architectures
(Bilkent University, 2022-01)Metamaterials are a type of artificial matt that can impose exotic functionalities beyond natural materials. These specifically designed sub-wavelength structures acquire these functionalities from their collective geometric ... -
Design of an X-band GaN based microstrip MMIC power amplifier
(Bilkent University, 2019-02)RF power amplifiers are crucial components of modern radar and communication systems. However, their design poses some challenges due to device limitations in high power and high frequency regime, as well as inherent ... -
Design of compact optical devices based on periodic meta-structures
(Bilkent University, 2013)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, ... -
Design of GaN-based coplanar multi-octave band medium power power MMIC amplifiers
(Bilkent University, 2013)Wideband amplifiers are employed in many applications such as military radar, electronic warfare and electronic instrumentations and systems, etc. This thesis project aims to build a wideband medium power monolithic ... -
Design, fabrication, and characterization of normally-off GaN HEMTS
(Bilkent University, 2019-07)GaN-based high-electron-mobility transistors (HEMTs) have been developing rapidly from the time when they were first demonstrated in the 1990s. They have consistently been presented as a displacement technology to silicon ... -
Development and characterization of a direct detection fiber optic distributed acoustic sensor
(Bilkent University, 2018-09)Phase-sensitive optical time domain re ectometer (ø-OTDR) based distributed acoustic sensor (DAS) systems have attracted increasing attention in recent years due to their remarkable advantages in a wide range of industrial ... -
Development and characterization of a megapixel SWIR imaging system
(Bilkent University, 2022-01)This thesis aims to develop a megapixel SWIR camera electronics and share the knowledge that has been acquired during the design phase as a detailed document that explains the theory and design steps to stand as a reference ... -
Development of fiber optical delay line based 10 GHZ phase noise measurement system
(Bilkent University, 2019-02)Microwave photonics is an emerging field of study exploiting broadband, low loss photonics technology for high spectral purity microwave generation, processing and distribution. Fiber optical delay lines are such systems ... -
Dielectric metasurfaces as passive radiative coolers, colorimetric refractive index sensors, color filters, and one-way perfect absorber/reflectors with transparent sidebands
(Bilkent University, 2020-07)Metamaterials define the class of synthetic, man-made materials with exotic properties that cannot be observed with natural materials. Their sub-wavelength counterparts are called metasurfaces. In particular, dielectric ... -
EBL fabricated plasmonic nanostructures for sensing applications
(Bilkent University, 2013)Plasmonics is a major branch of photonics dealing with light-matter interactions in metallic nanostructures. Plasmonic devices provide extreme confinement of electromagnetic oscillations to very small volumes beyond diffraction ... -
Electrically tunable plasmon induced transparency in hybrid metal-graphene structures
(Bilkent University, 2018-06)Hybrid metal-graphene structures offer design flexibility to manipulate and control light efficiently. These structures can be used to generate tunable plasmon induced transparency (PIT) in transmission and reflection mode. ... -
Enhanced confined microwave transmission by single subwavelength apertures
(Bilkent University, 2005)Grating-coupling phenomena between surface plasmons and electromagnetic waves are studied in the microwave spectrum using metallic circular apertures surrounded by an array of grooves. The measurements are performed in ...
