Browsing by Keywords "Plasmonics"
Now showing items 1-20 of 39
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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 ... -
Ald grown zno as an alternative material for plasmonic and uncooled infrared imaging applications
(Bilkent University, 2014)Plasmonics is touted as a milestone in optoelectronics as this technology can form a bridge between electronics and photonics, enabling the integration of electronics and photonic circuits at the nanoscale. Noble metals ... -
Applications of plasmon enhanced emission and absorption
(Bilkent University, 2009)The term plasmon-polariton is used to describe coupled modes of electromagnetic waves with electronic plasma oscillations in conductors. Surface plasmon resonances have found profound interest over the last few decades ... -
Chiral Structures: Manipulation of Asymmetric Transmission in Planar Chiral Nanostructures by Anisotropic Loss (Advanced Optical Materials 7/2013)
(2013)Asymmetric transmissions of circularly polarized optical waves can be achieved when the waves are incident normal to planar chiral structures, provided that the structures are anisotropic and lossy. In order to clarify how ... -
Colloidal photoluminescent refractive index nanosensor using plasmonic effects
(De Gruyter, 2018)Fluorescence enhancement by metal nanostructures which is sensitive to refractive index n of an ambient medium is suggested as an operation principle of a novel refractive index sensor for liquids. Calculations are made ... -
Comparison of back and top gating schemes with tunable graphene fractal metasurfaces
(American Chemical Society, 2016)In this work, fractal metasurfaces that consist of periodic gold squares on graphene are used to increase light-graphene interaction. We show by simulations and experiments that higher level fractal structures result in ... -
Design, fabrication and characterization of surface plasmon resonance based MEMS displacement sensors
(Bilkent University, 2009)Strong dependence of surface plasmon resonance (SPR) on coupling parameters offers new varieties of sensing mechanisms in nano and micro-scale engineering fields. In this study, design, fabrication and characterization ... -
Effect of gold nanoparticles size on light scattering for thin film amorphous-silicon solar cells
(Elsevier Ltd, 2014-05)In this work, the effect of gold (Au) nanoparticles on the performance of a-Si:H solar cells is investigated experimentally. The solar cell stack is grown on a highly doped p-type Si wafer and consists of 20nm heavily doped ... -
Electrochemically swithable plasmonic surfaces
(Bilkent University, 2014)In this study, we design and produce grating coupled surface plasmon surfaces which are switched by electrochemistry. Grating structures are fabricated using digital versatile discs (DVDs) which are commercially available. ... -
Electroluminescence efficiency enhancement in quantum dot light-emitting diodes by embedding a silver nanoisland layer
(Wiley-VCH Verlag, 2015)A colloidal quantum dot light-emitting diode (QLED) is reported with substantially enhanced electroluminescence by embedding a thin layer of Ag nanoislands into hole transport layer. The maximum external quantum efficiency ... -
Forces and Torques on the Nanoscale: From Measurement to Applications
(2012)The possibility of measuring microscopic forces down to the femtonewton range has opened new possibilities in fields such as biophysics and nanophotonics. I will review some of the techniques most often employed, namely ... -
Fourier transform plasmon resonance spectrometer
(Bilkent University, 2017-02)Nanophotonics is an emerging field of research aiming to control interaction of light with matter in nanometer scale. Electrons localized on metallic nanoparticles generate localized plasmon oscillations with interesting ... -
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Guided plasmon modes of a graphene-coated kerr slab
(Springer New York LLC, 2016)We study analytically propagating surface plasmon modes of a Kerr slab sandwiched between two graphene layers. We show that some of the modes that propagate forward at low field intensities start propagating with negative ... -
High-conductivity silicon based spectrally selective plasmonic surfaces for sensing in the infrared region
(Institute of Physics Publishing, 2017)Plasmonic perfect absorbers have found a wide range of applications in imaging, sensing, and light harvesting and emitting devices. Traditionally, metals are used to implement plasmonic structures. For sensing applications, ... -
Highly-doped silicon based photonic devices for mid-infrared light absorption
(Bilkent University, 2017-07)Electromagnetic wave absorbers have the potential to enable important applications in the mid-infrared wavelength range such as thermal imaging and infrared spectroscopy. The choice of absorbing material has signi cant ... -
Hyperspectral stochastic optical reconstruction raman microscopy for label-free super-resolution imaging using surface enhanced raman spectroscopy
(Springer Verlag, 2015)Super-resolution imaging is an emerging field that has attracted attention in the recent years due to far the reaching impact in biology. All super-resolution techniques use fluorescent labels to image nanoscale biomolecular ... -
Improved efficiency of thin film a-Si:H solar cells with Au nanoparticles
(Institute of Electrical and Electronics Engineers Inc., 2013)In this work, the effect of Au nanoparticles on the performance of a-Si:H solar cells is investigated experimentally. Au nanoparticles of 10, 20, 50, 80, 100, 200 and 400 nm are spin coated on ITO before metallization. The ... -
Manipulation of Asymmetric Transmission in Planar Chiral Nanostructures by Anisotropic Loss
(Wiley, 2013)Planar chiral structures may provide asymmetric transmission for circularly polarized optical waves at normal incidence if the structures are anisotropic and lossy, but the role of loss has not yet been clarified. Here, a ... -
Metal-insulator multistacks for absorption and photodetection
(Bilkent University, 2017-06)Metal-insulator (MI) stacks are one of the most studied nanoscale devices of the recent decade. These structures have opened a new door to endless photonic applications ranging from solar cells to waveguides and polarizers. ...
