208 citations · 1.2k across the 24 of their papers we have counts for
25 papers
Non-equilibrium hot-carrier transport in type-II multiple-quantum wells for solar-cell applications
H. P. Piyathilaka, R. Sooriyagoda, V. R. Whiteside +4
Prototypes for hot-carrier solar cells based on type-II InAs/AlAsSb multiple quantum wells are examined for AC photoconductivity as a function of lattice temperature and photoexcit…
Structure-Property-Performance Relationships of Cuprous Oxide Nanostructures for Dielectric Mie Resonance-Enhanced Photocatalysis
Ravi Teja A. Tirumala, Sunil Gyawali, Aaron Wheeler +7
Nanostructured metal oxides, such as Cu2O, CeO2, α-Fe2O3, and TiO2 can efficiently mediate photocatalysis for solar-to-chemical energy conversion and pollution remediation. In this…
Hot-carrier dynamics in InAs/AlAsSb multiple-quantum wells
Herath P. Piyathilaka, Rishmali Sooriyagoda, Hamidreza Esmaielpour +5
A type-II InAs/AlAsSb multiple-quantum well sample is investigated for the photoexcited carrier dynamics as a function of excitation photon energy and lattice tem…
Experimental and Computational Studies of the Optical Properties of CuAl1-xFexO2
Mina Aziziha, Saeed Akbarshahi, Suresh Pittala +7
Delafossites are promising candidates for photocatalysis applications because of their chemical stability and absorption in the solar region of the electromagnetic spectrum. For ex…
Carrier transport and electron-lattice interactions of nonlinear optical crystals CdGeP, ZnGeP and CdSiP
Rishmali Sooriyagoda, Herath P. Piyathilaka, Kevin T. Zawilski +2
Terahertz time-domain spectroscopy is employed to investigate temperature-dependent properties of bulk chalcopyrite crystals (CdGeP, ZnGeP and CdSiP). The complex spect…
Fast phase cycling in non-collinear optical two-dimensional coherent spectroscopy
Maria F. Munoz, Adam Medina, Travis M. Autry +5
As optical two-dimensional coherent spectroscopy (2DCS) is extended to a broader range of applications, it is critical to improve the detection sensitivity of optical 2DCS. We deve…
Optical Properties of Dilute CuAlFeO Delafossite Alloys
Mina Aziziha, S. Akbarshahi, S. Ghosh +6
For powder samples of CuAlFeO ( 0, 0.01, 0.05, and 0.1), measured optical properties are compared with model simulations and phonon spectra are compared with s…
Signatures of four-particle correlations associated with exciton-carrier interactions in coherent spectroscopy on bulk GaAs
D. Webber, B. L. Wilmer, X. Liu +4
Transient four-wave mixing studies of bulk GaAs under conditions of broad bandwidth excitation of primarily interband transitions have enabled four-particle correlations tied to de…
Role of Strain on the Coherent Properties of GaAs Excitons and Biexcitons
Brian L. Wilmer, Daniel Webber, Joseph M. Ashley +2
Polarization-dependent two-dimensional Fourier-transform spectroscopy (2DFTS) is performed on excitons in strained bulk GaAs layers probing the coherent response for differing amou…
Photocurrents in Bi2Se3: bulk versus surface, and injection versus shift currents
Derek A. Bas, Rodrigo A. Muniz, Sercan Babakiray +3
Optical injection and detection of charge currents can complement conventional transport and photoemission measurements without the necessity of invasive contact that may disturb t…
Preparation, characterization, and electrical properties of epitaxial NbO2 thin film lateral devices
Toyanath Joshi, Tess R. Senty, Pavel Borisov +2
Epitaxial NbO2 (110) films, 20 nm thick, were grown by pulsed laser deposition on Al2O3 (0001) substrates. The Ar/O2 total pressure during growth was varied to demonstrate the grad…
Multidimensional Coherent Spectroscopy of a Semiconductor Microcavity
Brian L. Wilmer, Felix Passmann, Michael Gehl +2
Rephasing and non-rephasing two-dimensional coherent spectra map the anti-crossing associated with normal-mode splitting in a semiconductor microcavity. For a 12-meV detuning range…
Coherent control of injection currents in high-quality films of Bi2Se3
D. A. Bas, K. Vargas-Velez, S. Babakiray +5
Films of the topological insulator Bi2Se3 are grown by molecular beam epitaxy with in-situ reflection high-energy electron diffraction. The films are shown to be high-quality by X-…
Ultrafast carrier dynamics in thin-films of the topological insulator Bi2Se3
Yuri D. Glinka, Sercan Babakiray, Trent A. Johnson +2
Transient reflectivity measurements of thin films, ranging from 6 to 40 nm in thickness, of the topological insulator Bi2Se3 revealed a strong dependence of the carrier relaxation…
Terahertz emission from ZnGeP2: Phase-matching, intensity and length scalability
Joseph D. Rowley, Derek A. Bas, Kevin T. Zawilski +2
Collinear phase-matched optical rectification is studied in ZnGeP pumped with near-infrared light. The pump-intensity dependence is presented for three crystal lengths (0.3,…
Terahertz Waveguiding in Silicon-Core Fibers
Derek A. Bas, Scott K. Cushing, John Ballato +1
We propose the use of a silicon-core optical fiber for terahertz (THz) waveguide applications. Finite-difference time-domain simulations have been performed based on a cylindrical…
Effect of Monolayer Thickness Fluctuations on Coherent Exciton Coupling in Single Quantum Wells
Yuri D. Glinka, Zheng Sun, Mikhail Erementchouk +5
Monolayer fluctuations in the thickness of a semiconductor quantum well (QW) lead to three types of excitons, located in the narrower, average and thicker regions of the QW, which…
Terahertz generation by optical rectification in uniaxial birefringent crystals
J. D. Rowley, J. K. Wahlstrand, K. T. Zawilski +3
The angular dependence of terahertz (THz) emission from birefringent crystals can differ significantly from that of cubic crystals. Here we consider optical rectification in uniaxi…
Two-dimensional double-quantum spectra reveal collective resonances in an atomic vapor
Xingcan Dai, Marten Richter, Hebin Li +4
We report the observation of double-quantum coherence signals in a gas of potassium atoms at twice the frequency of the one-quantum coherences. Since a single atom does not have a…
Broadband terahertz pulse emission from ZnGeP_2
J. D. Rowley, J. K. Pierce, A. T. Brant +4
Optical rectification is demonstrated in (110)-cut ZnGeP_2 (ZGP) providing broadband terahertz (THz) generation. The source is compared to both GaP and GaAs over a wavelength range…
Two-dimensional Fourier-transform Spectroscopy of Potassium Vapor
X. Dai, A. D. Bristow, D. Karaiskaj +1
Optical two-dimensional Fourier-transformed (2DFT) spectroscopy is used to study the coherent optical response of potassium vapor in a thin transmission cell. Rephasing and non-rep…
Many-body two-quantum coherences in semiconductor nanostructures
Denis Karaiskaj, Alan D. Bristow, Lijun Yang +4
We present experimental coherent two-dimensional Fourier transform spectra of the exciton resonances in semiconductor quantum wells for a pulse sequence that isolates two-quantum c…
A Versatile Ultra-Stable Platform for Optical Multidimensional Fourier-Transform Spectroscopy
A. D. Bristow, D. Karaiskaj, X. Dai +5
The JILA Multidimensional Optical Nonlinear SpecTRometer (JILA-MONSTR) is a robust, ultra-stable platform consisting nested and folded Michelson interferometers that can be activel…
Polarization dependence of semiconductor exciton and biexciton contributions to phase-resolved optical two-dimensional Fourier-transform spectra
Alan D. Bristow, Denis Karaiskaj, Xingcan Dai +2
We study the coherent light-matter interactions of GaAs quantum wells associated with excitons, biexcitons and many-body effects. For most polarization configurations, excitonic fe…