A5091675230- Spectroscopy and Laser Applications
- Laser Design and Applications
- Semiconductor Lasers and Optical Devices
- Atmospheric Ozone and Climate
- Ion channel regulation and function
- Nicotinic Acetylcholine Receptors Study
- Venomous Animal Envenomation and Studies
- solar cell performance optimization
- Ginseng Biological Effects and Applications
- Photonic and Optical Devices
- Natural product bioactivities and synthesis
- Pharmacological Effects of Natural Compounds
- Inflammatory mediators and NSAID effects
- Advanced Synthetic Organic Chemistry
- Food Quality and Safety Studies
- Phytochemistry and Biological Activities
- Thermal Radiation and Cooling Technologies
- Diabetes Treatment and Management
- Analytical Chemistry and Sensors
- Silicon and Solar Cell Technologies
- Natural Compounds in Disease Treatment
- Thin-Film Transistor Technologies
- Nanowire Synthesis and Applications
- Connexins and lens biology
- Phytochemical compounds biological activities
University of Wisconsin–Madison
2017-2025
University of Wisconsin System
2021
Gwangju Institute of Science and Technology
2010-2020
Sookmyung Women's University
1997-2015
University of Illinois Urbana-Champaign
2010-2012
Seoul National University
1989-1990
Notched islands on a thin elastomeric substrate serve as platform for dual-junction GaInP/GaAs solar cells with microscale dimensions and ultrathin forms stretchable photovoltaic modules. These designs allow high degree of stretchability areal coverage, they provide natural form strain-limiting behavior, helping to avoid destructive effects extreme deformations. Detailed facts importance specialist readers are published "Supporting Information". Such documents peer-reviewed, but not...
The step-taper active-region (STA) design concept is implemented for ~5.0 μm-emitting quantum cascade lasers (QCLs) grown by metal-organic chemical vapor deposition (MOCVD). Carrier-leakage suppression yields high characteristic temperatures the threshold-current density Jth, T0, and slope efficiency ηsl, T1: 226 K 653 K. Resonant-tunneling extraction from lower level results in miniband-like extraction. In turn, internal ηi found, a variable mirror-loss study, to be ~77%; thus approaching...
A type of compact (∼cm2) high voltage photovoltaic module that utilizes large collections ultrathin (∼15 μm), small (∼45 μm wide, ∼1 mm long) silicon solar cells was fabricated and characterized. Integration on thin sheets plastic yielded flexible modules with per-cell efficiencies ∼8%, outputs >200 V, maximum power >1.5 mW.
Quantum cascade lasers (QCLs) have emerged as promising candidate sources for free-space communications. High optical power densities, short photon lifetimes, and low internal capacitance are important factors influencing the transmission bandwidth. We report design fabrication of 4.7 μm emitting, 1.5 mm cavity length, single-mode distributed-feedback QCLs, with a CW front-facet output 165 mW calculated lifetime 11.6 ps, resulting in an electrically limited modulation 3 dB cutoff at 850 MHz.
Background: N-type Ca 2+ channels (Ca v 2.2) play an important role in the transmission of pain signals to central nervous system. ω-Conotoxin (CTx)-MVIIA, also called ziconotide (Prialt®), effectively alleviates pain, without causing addiction, by blocking pores these channels. Unfortunately, CTx-MVIIA has a narrow therapeutic window and produces serious side effects due poor reversibility its binding channel. It would thus be desirable identify new analgesic blockers with characteristics...
Understanding the band bending at interface of GaN/dielectric under different surface treatment conditions is critically important for device design, performance, and reliability. The effects ultraviolet/ozone (UV/O3) GaN on energy atomic-layer-deposition (ALD) Al2O3 coated Ga-polar were studied. UV/O3 post-ALD anneal can be used to effectively vary bending, valence offset, conduction dipole Al2O3/GaN interfaces. increases GaN, improves uniformity deposition, changes amount trapped charges...
Abstract Dielectrophoresis using multi-electrode arrays allows a non-invasive interface with biological cells for long-term monitoring of electrophysiological parameters as well label-free and non-destructive technique neuronal cell manipulation. However, experiments manipulation utilizing dielectrophoresis have been constrained because devices generally function outside the controlled environment ( i.e . incubator) during process, which is problematic neurons are highly susceptible to...
Kurtoxin is a 63-amino acid polypeptide isolated from the venom of South African scorpion Parabuthus transvaalicus. It first and only peptide ligand known to interact with Cav3 (T-type) voltage-gated Ca(2+) channels high affinity modify voltage-dependent gating these channels. Here we describe nuclear magnetic resonance (NMR) solution structure kurtoxin determined using two- three-dimensional NMR spectroscopy dynamical simulated annealing calculations. The molecular toxin was highly similar...
Measurements of beam stability for mid-infrared (IR)-emitting quantum cascade lasers (QCLs) are important applications that require the to travel through air remote targets, such as free-space communication links. We report beam-quality measurement results narrow-ridge, 4.6 µm-emitting buried-heterostructure (BH) QCLs fabricated using ICP etching and HVPE regrowth. Beam-quality measurements under QCW operation exhibit M 2 < 1.2 up 1 W ∼5 µm-wide ridges. 5 devices display some small degree...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Sesquiterpene Alkaloids from Euonymus japonica: Structures of Euojaponines D, F, J, and KByung Hoon Han, Jae Ha Ryu, Yong Nam Man Ki Park, Jeong Hill Hideo NaokiCite this: J. Nat. Prod. 1990, 53, 4, 909–914Publication Date (Print):July 1, 1990Publication History Published online1 July 2004Published inissue 1 1990https://pubs.acs.org/doi/10.1021/np50070a018https://doi.org/10.1021/np50070a018research-articleACS PublicationsRequest reuse...
Abstract Background Abalone has long been used as a valuable food source in East Asian countries. Although the nutritional importance of abalone reported through vitro and vivo studies, there is little evidence about potential anti-tumor effects visceral extract. The aim present study to examine efficacy extract elucidate its working mechanism. Methods In study, we breast cancer model using BALB/c mouse-derived 4T1 mammary carcinoma investigated effect on tumor development. Inhibitory...
Photo detection of ultraviolet (UV) light remains a challenge since the penetration depth UV is limited to nanometer scale. Therefore, doping profile and electric field in top range photo devices become critical. Traditional photodetectors usually use constant near semiconductor surface, resulting negligible field, which limits photo-generated carrier collection efficiency photodetector. Here, we demonstrate, via an optimized gradient boron technique, that responsivity under wavelength...
We demonstrate the effectiveness of current confinement via proton implantation for a three-element phase-locked array ~ 5.3 μm-emitting quantum cascade lasers (QCLs). The drastically reduces electrical conductivity active-core region material, in InGaAs/InAlAs QCLs, thus converting it to semi-insulating material. process is shown be effective increasing pumping efficiency resonant leaky-wave coupled structure, thereby improving device performance. threshold an implanted 3.26 A; that is,...
We present results and analysis of 5 Gb/s On-Off-Keyed (OOK) data transmission at ~ 4.6-micron wavelength using, room temperature, a directly modulated, single-mode DFB-QCL transmitter Resonant-Cavity Infrared Detector (RCID) receiver. The design enables relatively high 165-mW CW output power. used 3-mm device with 4-micron aperture for stable single-spatial-mode operation, operating 65 mW. RCID detector suppresses background radiation while providing enhanced quantum efficiency, 60%, low...
Semiconductor heterostructure is a critical building block for modern semiconductor devices. However, forming heterostructures of lattice-mismatch has been great challenge several decades. Epitaxial growth infeasible to form abrupt with large while mechanical-thermal bonding results in high density interface defects and therefore severely limits device applications. Here we show an ultra-thin oxide-interfaced approach the successful formation lattice-mismatched heterostructures. Following...
A three-element phase-locked array of ~5.3 μm-emitting quantum cascade lasers fabricated by a two-step MOCVD process is demonstrated which operates in diffraction-limited beam to 5.3 W peak pulsed power. To compensate for overetching at the edges, fabrication was modified such that it resulted elements equal width. Then pure in-phase mode, agreement with simulations based on actual device dimensions, indicate resonant leaky-wave coupling occurs this device's geometry. Measured uniform...