III-V nitrides have been put to use in a variety of applications including laser diodes for modern DVD devices and for solid-state white lighting. Plasmonics has come to the foreground over the past decade as a means for increasing the internal quantum efficiency (IQE) of devices through resonant interaction with surface plasmons which exist at metal/dielectric interfaces. Increases in emission intensity of an order of magnitude have been previously reported using silver thin-films on InGaN/GaN MQWs. the dependence on resonant interaction between the plasmons and the light emitter limits the applications of plasmonics for light emission. This dissertation presents a new non-resonant mechanism based on electrostatic interaction of carriers with induced image charges in a nearby metallic nanoparticle. Enhancement similar in strength to that of plasmonics is observed, without the restrictions imposed upon resonant interactions. in this work we demonstrate several key features of this new interaction, including intensity-dependent saturation, increase in the radiative recombination lifetime, and strongly inhomogeneous light emission. We also present a model for the interaction based on the aforementioned image charge interactions. Also discussed are results of work done in the course of this research resulting in the development of a novel technique for strain measurement …

Weekly newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.

Daily newspaper from San Antonio, Texas that includes local, state and national news along with advertising.

This article reports a new mechanism based on electrostatic interactions of carriers and their image charges in metals to generate more photons from optical sources at frequencies that are off-resonant to the localized plasmon frequency.

Daily Spanish-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.

Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.

Tri-weekly newspaper from San Antonio, Texas that includes local, state and national news along with advertising.

Compilation of forms that provide an overview of topics, names, and other content of original documents on microfilm at the Old Spanish Mission Historical Research Library.

Group III nitrides are efficient light emitters. The modification of internal optoelectronic properties of these materials due to strain, external or internal electric field are an area of interest. Insertion of metal nanoparticles (MNPs) (Ag, Au etc) inside the V-shaped inverted hexagonal pits (IHP) of InGaN/GaN quantum wells (QWs) offers the potential of improving the light emission efficiencies. We have observed redshift and blueshift due to the Au MNPs and Ag MNPs respectively. This shift could be due to the electric field created by the MNPs through electrostatic image charge. We have studied the ultrafast carrier dynamics of carriers in hybrid InGaN/GaN QWs. The change in quantum confinement stark effect due to MNPs plays an important role for slow and fast carrier dynamics. We have also observed the image charge effect on the ultrafast differential transmission measurement due to the MNPs. We have studied the non-linear absorption spectroscopy of these materials. The QWs behave as a discharging of a nanocapacitor for the screening of the piezoelectric field due to the photo-excited carriers. We have separated out screening and excitonic bleaching components from the main differential absorption spectra of InGaN/GaN QWs.

The effects of surface plasmon for InGaN/GaN multi-quantum wells and ZnO nanoparticles optical linear and nonlinear emission efficiency had been experimentally studied. Due to the critical design for InGaN MQWs with inverted hexagonal pits based on GaN, both contribution of surface plasmon effect and image charge effect at resonant and off resonant frequencies were experimentally and theoretically investigated. With off- resonant condition, the InGaN MQWs emission significantly enhanced by metal nanoparticles. This enhancement was caused by the image charge effect, due to the accumulation of carriers to NPs region. When InGaN emission resonated with metal particles SP modes, surface Plasmon effect dominated the emission process. We also studied the surface plasmon effect for ZnO nanoparticles nonlinear optical processes, SHG and TPE. Defect level emission had more contribution at high incident intensity. Emissions are different for pumping deep into the bulk and near surface. A new assumption to increase the TPE efficiency was studied. We thought by using Au nanorods localized surface plasmon mode to couple the ZnO virtual state, the virtual state’s life time would be longer and experimentally lead the emission enhancement. We studied the TPE phenomena at high and near band gap energy. Both emission intensity and decay …

Commencement program for the spring 2012 graduating class of the University of North Texas, held in the UNT Coliseum on Friday and Saturday, May 11-12, 2012. The program contains the order of service and a list of graduates for the baccalaureate, master's, doctoral degrees.

This presentation discusses the digital infrastructure of the University of North Texas (UNT) Libraries. It gives a timeline of the UNT Libraries' digital projects with examples.

Weekly African-American newspaper from Houston, Texas that includes local, state, and national news along with advertising.

Weekly African-American newspaper from Houston, Texas that includes local, state, and national news along with advertising.

Weekly newspaper from Dallas, Texas that includes news and information concerning the labor movement along with advertising.

Twenty-eight (28) faculty researchers focused on High Energy Particle Physics, Novel Thin Film Materials for Optoelectronic Applications, and Catalytic Processes for Energy Sources and Environmental Detoxification to address problems cited as priorities by the DOE and local agencies. The High Energy Particle Physics cluster has DOE-competitive funding, and the number of cluster investigators who have competitive mainstream funding has increased from 2 to 13 since the inception of the program. In this reporting period, 8 postdoctorals, 38 graduate studnets, and 23 undergraduates were involved in DOE projects, and 191 publications and 238 presentations were generated. The UPR-Arecibo Integrated Science Multi-Use Laboratory provided workshops and other activities that directly impacted 360 teachers and 600 students and indirectly impacted over 25,000 through the enhancement of teachers' skills and knowledge.

This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.

Weekly African-American newspaper from Houston, Texas that includes local, state, and national news along with advertising.

Weekly African-American newspaper from Houston, Texas that includes local, state, and national news along with advertising.

Weekly Czech language newspaper from West, Texas published as the official organ of the Slavonic Benevolent Order of the State of Texas that includes news of interest to members, and local, state and national news along with advertising.

Daily newspaper from Yoakum, Texas that includes local, state and national news along with extensive advertising.

Daily newspaper from Mount Pleasant, Texas that includes local, state, and national news along with advertising.

Daily newspaper from Bryan, Texas that includes local, state, and national news along with advertising.

Daily newspaper from Cuero, Texas that includes local, state, and national news along with advertising.