Materials Literature
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Nanowires based on the III nitride materials system have attracted attention as potential nanoscale building blocks in optoelectronics, sensing, and electronics. However, before such applications can be realized, several challenges exist in the areas of controlled and ordered nanowire synthesis, fabrication of advance…
Biomaterials such as nucleic acids and proteins can be exploited to create higher order structures. The biomolecular components such as DNA and peptides have been used to assemble nanoparticles with high fidelity. Here, we use DNA and peptides, and their preferential interaction with inorganic and carbon nanomaterials…
Robust, tunable Surface enhanced Raman spectroscopy (SERS) substrates were created using the Langmuir-Blodgett technique. Initial studies of Langmuir-Blodgettry were done with arachidic acid to optimize monolayer deposition parameters. Hydrophilic and hydrophobic glass substrates were prepared and coated with arachidi…
Abstract Single crystals of the new title compound are prepared by reaction of Ce, CeCl3, and NaN3 in a reactive NaCl flux (850 °C, 7 d).
A method is proposed to analyze the mutual coherence function of a general x-ray beam. The mutual coherence function is shown to be the Fourier pair of the wavevector distribution of the beam inside a finite volume. A rocking-curve profile to be measured with a perfect-crystal plate is calculated as a kind of one-dime…
We theoretically investigate the effect of fabrication-related disorders on subwavelength metal-dielectric-metal plasmonic waveguides. We use a Monte Carlo method to calculate the roughness-induced excess attenuation coefficient with respect to a smooth waveguide. We find that the excess attenuation is mainly due to r…
In this study, we report multilayer metallo-dielectric stacks that simultaneously possess a zero refractive index and an impedance match to free space in the near-IR. A genetic algorithm (GA) was used to optimize the screen geometries and dimensions of the zero index metamaterials (ZIMs) that consisted of alternating…
Modifications in scattering strength of and local field enhancement by retardation-based plasmonic nanoantennas when being transformed from straight nanorods to split-rings are investigated. The scattering properties are monitored by linear reflection and extinction spectroscopy whereas local field enhancement is esti…
Zinc Oxide nanostructures are capable of applying numerous applications such as optoelectronics, sensors, varistors, and electronic devices. There are several techniques to gorw ZnO nanostructures, including vapor-liquid-solid method, chemical vapor deposition, physical vapor deposition, metal organic chemical vapor d…
We extend the Green's function integral method to investigate the propagation of electromagnetic waves through an anisotropic dielectric-magnetic slab. From a microscopic perspective, we analyze the interaction of wave with the slab and derive the propagation characteristics by self-consistent analyses. Applying the r…
This paper describes a snapshot Mueller matrix polarimeter by wavelength polarization coding. This device encodes polarization states in the spectral domain through use of a broadband source and high-order retarders. This allows one to measure a full Mueller matrix from a single spectrum whose acquisition time only de…
We have successfully manufactured rubber-like large-area stretchable integrated circuits comprising printed elastic conductors, organic transistor-based circuits, and silicon transistor-based circuits. Employing the first direct integration of organic and silicon (Si) integrated circuits, we have realized to develop a…
In this work the Eu3+ ion was used as optical probe, by considering its hypersensitive transitions to follow changes in the local environment. Eu3+ ions were incorporated into gel via dissolution of soluble species into the initial precursor TiO2 sol. The TiO2/Eu3+ films were spin-coated on glass wafers. A spectroscop…
Here we investigate the interaction of metallic nanoparticles which support localized surface plasmon resonances (LSPR). We use dark-field spectroscopy and normal-incidence transmission spectroscopy to investigate the scattering and extinction of metallic nanoparticles on their own and in both ordered and random array…
We present a negative refractive index medium (NRIM) operating at multiple-angle incidences by expanding a conventional planar metamaterial to a three-dimensional (3D) structure. The proposed 3D NRIM is comprised of semi-spherical metal shells and planar plamonic wires, thus giving rise to negative magnetic permeabili…
Bidirectional reflectance distribution has been measured from an atomic-force-microscope (AFM)-patterned surface for the first time. The AFM was used to generate a two-dimensional square array of sub-wavelength surface features from a single material at a scale large enough to permit optical characterization. A diamon…
Optical characteristic of a pair of subwavelength holes on metallic thin film has been studied by numerical simulation and FIB-assisted experiment. Each hole is in a square shape with four corners having fillets. One hole is set up adjascent to another by bringing the most pointed corners close to each other. As a res…
The Dyakonov-Tamm wave combines the features of the Dyakonov wave and the Tamm electronic state. Dyakonov-Tamm waves guided by the planar interface of two dissimilar chiral sculptured thin films (STFs) were systematically examined. The interfaces result from the chiral STFs being dissimilar in (a) orientation about th…
We report on the nonlinear optical (NLO) transmittance and reflectance of a 20 nm-thick Ag film characterized by time-resolved white-light continuum pump-probe experiments. The change in complex permittivity Δε(t) is extracted and is fitted to the Drude model in the frequency domain and a two-temperature model in the…
We present a novel nanostructure, metallic nanocomb structures, electro-chemically self assembled on nanoporous alumina templates. Gold and silver nanowires between 5-15 nm have been produced through the ordered nano-scale pores of alumina templates prepared by anodization of aluminum foils. These ultrathin nanowires…