István Robel
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A laboratory-scale greenhouse for spectroscopic monitoring of plants and associated gas-phase isotopic fractionation Open
The ability to monitor isotopic fractionation in terrestrial ecosystems is a challenge due to the presence of interacting variables. A laboratory-scale apparatus for controlled experiments could serve as a useful platform to deconvolute th…
View article: Perspectives on Designer Photocathodes for X-ray Free-Electron Lasers: Influencing Emission Properties with Heterostructures and Nanoengineered Electronic States
Perspectives on Designer Photocathodes for X-ray Free-Electron Lasers: Influencing Emission Properties with Heterostructures and Nanoengineered Electronic States Open
Here, the development of photoemission electron sources to specifically address the competing andnincreasingly stringent requirements of advanced light sources such as X-ray Free Electron Lasers (XFELs) motivates a comprehensive material-c…
Auger Up-Conversion of Low-Intensity Infrared Light in Engineered Quantum Dots Open
One source of efficiency losses in photovoltaic cells is their transparency toward solar photons with energies below the band gap of the absorbing layer. This loss can be reduced using a process of up-conversion whereby two or more sub-ban…
Phonon-assisted nonlinear optical processes in ultrashort-pulse pumped optical parametric amplifiers Open
Optically active phonon modes in ferroelectrics such as potassium titanyl phosphate (KTP) and potassium titanyl arsenate (KTA) in the ~7–20 THz range play an important role in applications of these materials in Raman lasing and terahertz w…
View article: Spectral and Dynamical Properties of Single Excitons, Biexcitons, and Trions in Cesium–Lead-Halide Perovskite Quantum Dots
Spectral and Dynamical Properties of Single Excitons, Biexcitons, and Trions in Cesium–Lead-Halide Perovskite Quantum Dots Open
Organic-inorganic lead-halide perovskites have been the subject of recent intense interest due to their unusually strong photovoltaic performance. A new addition to the perovskite family is all-inorganic Cs-Pb-halide perovskite nanocrystal…
Influence of Intrinsic Phonon Modes in Nonlinear Optical Crystals on the Performance of Ultrafast Frequency Conversion Devices Open
We demonstrate that coherently-excited Raman-/IR-active phonons in certain nonlinear optical crystals (KTiOPO4, KTiOAsO4) significantly affect the operation of ultrashort-pulse pumped optical parametric amplifiers. The photon-phonon coupli…