Materials Literature
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The benefit of achieving high electron mobilities in transparent conducting oxides (TCOs) is twofold: they first exhibit superior optical properties, especially in the NIR spectral range, and secondly their low resistivity enables the usage of thinner films. Remarkably high mobilities can be obtained in Al-doped zinc…
Nano-colloids and nano-crystals doped with ions of rare-earth elements have recently attracted a lot of attention in the scientific community. This attention is due to unique physical, chemical and optical properties attributed to nanometer size of the particles. They have great potential of being used in applications…
Base on the same two monomers, diphenolic acid (DPA) and isophthaloyl chloride (IPC), three chromophore-containing nonlinear optical (NLO) polyarylate polymers were prepared. A tricyanofuran (TCF)-acceptor type chromophore group was in main-chain (mPAR-chr1), side-chain (sPAR-chr1) and side-chain with a 1,1-bis(4-hydr…
Flexible electronic circuitry is an emerging technology that will significantly impact the future of healthcare and medicine, food safety inspection, environmental monitoring, and public security. Recent advances in drop-on-demand printing technology and electrically conductive inks have enabled simple electronic circ…
Optical and infrared antennas provide a promising way to couple photons in and out of nanoscale structures. As counterpart to conventional radio antennas, they are able to increase optical fields in sub-wavelength volumes, to enhance excitation and emission of quantum emitters or to direct light, radiated by quantum e…
We have demonstrated that fabrication of the ZnO nanowire/GaN hetero-junction light emitting diode (LED) by contacting the tip of the ZnO nanowires with the GaN film, and UV electroluminescence from the p-n junction. In this study, we fabricated the heterojunction by directly-growth of the ZnO nanowires on the GaN fil…
The technological demand to push the gigahertz switching speed limit of today’s magnetic memory/logic devices into the terahertz (1THz=1ps−1) regime underlies the entire field of spin–electronics and integrated multi- functional devices. This challenge is met by all–optical magnetic switching based on coherent spin ma…
We investigate the optical scattering properties of self-assembled nanoporous anodized aluminum oxide (AAO) films, and propose integrating AAO as a backscattering layer for light management in thin film photovoltaics. Angle selective scattering and direction of light to extreme, near-horizontal angles can enable new f…
Glasses embedded with Dysprosium and Samarium were made by the melt quenching technique. Dy3+ -doped glasses exhibited bright white luminescence under 10 mW of 405 nm diode laser excitation. Color rending index of the glass was improved by adding Sm3+ as a co-dopant to the glass. Spectroscopic results of the glasses a…
Ga doping of ZnO allows for generation of free electrons up to concentrations of about 1021 cm-3 without significant deterioration of the crystal structure. In this way, a metallic dielectric function is formed with a negative-to-positive crossover of the real part tunable from mid infrared up to telecommunication wav…
This study explores comprehensively the carrier dynamics in ZnSeO and ZnTeO using photoluminescence (PL) and time-resolved PL spectroscopy. As the O concentration increases, the PL emissions shift toward lower energies. Additionally, the PL lifetime increases with increasing O contents and the decay curves exhibit com…
Single-walled carbon nanotubes (SWCNTs) encapsulating fullerenes, the so-called “nanopeapods (NPDs)”, are expected as building blocks in future nanoelectronics because the mechanical and electronic properties of SWCNTs frequently undergo considerable modification with the encapsulation of molecules at a nanometer scal…
High-quality epitaxial ZnO films on c-plane sapphire substrates have been obtained by utilizing off-axis sputtering configuration together with buffer layers prepared via nitrogen mediated crystallization (NMC). The role of NMC buffer layers is to provide high density of nucleation site and thus to reduce the strain e…
Hyper Rayleigh Scattering (HRS) is used to determine the absolute first hyperpolarizability of gold nanorods with an aspect ratio of 2.2 and 2.7. Two different long axis lengths are used, namely 25.5 nm and 64 nm. This allows for a discussion of the size effect for these centrosymmetric nanoparticles. A comparison of…
Rigorous optical simulations are an important tool in optimizing scattering properties of nano-photonic devices and are used, for example, in solar cell optimization. The finite element method (FEM) yields rigorous, timeharmonic, high accuracy solutions of the full 3D vectorial Maxwell's equations1 and furthermore all…
Second Harmonic Generation (SHG) was used to study the optical properties of molecular films formed at liquid interfaces (air-water or dodecane-water interfaces). The technique was applied to a two-dimensional film of hemicyanine molecules: dye (4-(4-dihexadecylaminostyryl)-N-methylpyridinium iodide) (DiA) and 4-(4-(d…
In this paper, we introduce a floating plasmonic absorber having multiple resonances in the 8 ~ 14 μm spectral range and broadband absorption characteristics by adjusting Drude relaxation rate of metal. This plasmonic broadband resonator capable of capturing light with a large optical cross-section area is able to sub…
Through the application of a bias voltage, metamaterials can dynamically change their response, opening up new technological possibilities. Combining design elements from three common metamaterial patterns, we have created a metamaterial polarizing filter that will transmit all polarization orientations equally when i…
In this paper, we propose a surface plasmon resonance (SPR) sensor with metallic nano-particles, which is based on the Kretschmann configuration for reflective-type measurement with enhanced sensitivity. The proposed structure is analyzed and compared with a conventional Kretschmann configuration by using 3D finite-di…
The authors propose an alternative method for high resolution optical microscopy - Evanescent Field Scanning Optical Microscopy (EFSOM) which eliminates implementation of the scanning tip compare to classical NSOM technique. The approach involves scanning a sample in the evanescent-field of a prism generated using tot…