Materials Literature
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Nanotransistors offer great prospect for the development of innovative THz detectors based on the non-linearity of transport characteristics. Semiconductor nanowires are appealing for their one-dimensional nature and intrinsically low capacitance of the devices, while graphene, with its record-high room-temperature mo…
In this paper, we theoretically study optical responses of tightly-coupled terahertz metamaterial. Unlike loosely-coupled one, tightly-coupled metamaterials exhibit resonant optical responses that are highly dependent on the interaction between each unit resonators. In order to predict optical response and spectral be…
Results of Raman studies of magnetic phase transitions of hexagonal LuMnO3 single crystal and HoMnO3 thin films are compared directly with the results of magnetic measurements. Our results show that the temperature dependent Raman study of magnon scattering provides a simple and accurate method for investigating magne…
We analyze a plasmonic gap-mode Fabry-Perot nanocavity containing a metallic nanowire. The proper choice of the cladding layer brings about a decent confinement inside the active region for the fundamental and first-order plasmonic gap modes. We numerically extract the reflectivity of the fundamental and first-order m…
A stainless steel stent, a minimally invasive medical device with delicate structure manufactured out of a stainless steel tube by laser cutting [1], is usually used to treat arterial stenosis [2]. Along with their increasing popularity in medical field, studies on them have been extended from the typical clinical set…
We have determined electronic properties of methyl-phosphonic acid adsorbed on ZnO nanowire structures using semi-local and hybrid Hartree-Fock density functionals. We find a bidentate binding of the molecular groups to the ZnO surface and a strong enhancement of the density of states near the top of the valence band.
When metal layers like Ag or Cu deposited on the amorphous chalcogenide films such as As2S3, As2Se3, GeS2, and GeSe2, are illuminated by light, the metal elements diffuse abnormally into the amorphous chalcogenide layer. This abnormal diffusion of metal was found by Kostyshin in Russia in 1965 and called photodoping.…
Recently, ZnO-based semiconductors have been deposited on various substrates using various methods. Furthermore, they were used in ultraviolet light-emitting diodes (UVLEDs) due to inherent properties including wide direct bandgap and high binding energy. In this work, two different deposition systems were utilized to…
Low refractive index polymers are used as cladding materials for high numerical aperture (NA) fibers. Since transparent fluoro polymers are ideal for this application, they have been used over many years. However, some fluoro chemicals face an issue related to perfluoro octanoic acid (PFOA) which is caused by its long…
State-of-the-art concentrators use free-space optics to concentrate sunlight onto photovoltaic cells. To achieve high concentration factors it is necessary to track the sun’s position. In current systems, mechanical actuators keep the focal spot in the solar cell. Planar concentrators have recently emerged, which use…
Zinc oxide (ZnO) is a material of great interest for short-wavelength optoelectronic applications due to its wide band gap (3.37 eV) and high exciton binding energy (60 meV). Due to the difficulty in stable p-type doping of ZnO, other p-type materials such as gallium nitride (GaN) have been used to form heterojunction…
Chalcogenide glasses, namely the amorphous compounds containing sulfur, selenium, and/or tellurium, have emerged as a promising material candidate for mid-infrared integrated photonics given their wide optical transparency window, high linear and nonlinear indices, as well as their capacity for monolithic integration…
A technique for local layer transfer and simultaneous crystallization of amorphous silicon (a-Si) films with midair cavity induced by near-infrared semiconductor diode laser (SDL) irradiation is demonstrated. After SDL irradiation, the silicon (Si) films were completely transferred and crystallized simultaneously on c…
Optical techniques have been intensively developed for many decades in terms of both experimental and modeling capabilities. In spectroscopy and scatterometry material structures can be measured and modeled from the atomic (binding configurations, electronic band structure) through nanometer (nanocrystals, long range…
Ultrathin materials and nano-structuring are becoming essential for the functionalization of optical surfaces. In the talk we will show how ultrathin metals can be exploited to create competitive transparent electrodes. At the same time they can be used to create nanostructured surfaces through mass scalable dewetting…
Traditional numerical analyses of laser beam transmission through “active” nonlinear materials have involved many assumptions that narrow their general applicability. As more complex optical phenomena are widely employed in research and industry, it is necessary to expand the use of numerical simulation methods. Histo…
We investigate a novel light conversion scheme in nanostructures for the highly demanding field of plasmonic solar cells. In our study, we incorporate vertical nanorods made of semiconductor materials, which are coupled optically to plasmonic nanoantennas for optimal absorption of sunlight. Utilizing the unique proper…
The liquid crystals (LCs) form various types of nano- and micro- structures in a self-organized manner. In recent years, numerous studies have been carried out to develop novel types of optical functional materials and devices utilizing such self-organizing characteristics of the LCs. Based on the finite-difference ti…
Zinc oxide (ZnO) nano/microstructures have been attractive as the building blocks for the efficient opto-electronic devices in the ultraviolet (UV) region. We have succeeded in growing the ZnO micro/nanosphere by a simple laser ablation in the air, and therefore we have obtained UV lasing from the sphere under optical…
We review our work on hybrid gold nanoparticles that are optimized for their bright fluorescence and photobleaching resistance. Our first goal in using gold nanoparticles is to load a large density of photoactive molecules onto a biocompatible nanoplatform. Our second goal is to optimize the molecule-gold nanoparticle…