Results 41 to 50 of about 3,950 (203)
Photoacoustics, 2023 In this work, a comparison between Quartz Enhanced Photoacoustic Spectroscopy (QEPAS) and Beat Frequency-QEPAS (BF-QEPAS) techniques for environmental monitoring of pollutants is reported.
Biao Li +9 more
doaj +1 more source
Saturation of interband absorption in graphene
, 2010 The transient response of an intrinsic graphene, which is caused by the ultrafast interband transitions, is studied theoretically for the range of pumping correspondent to the saturated absorption regime.
D. Potter, F. T. Vasko, F. T. Vasko
core +1 more source
Effect of carrier recombination on ultrafast carrier dynamics in thin films of the topological insulator Bi2Se3 [PDF]
, 2014 Transient reflectivity (TR) from thin films (6 - 40 nm thick) of the topological insulator Bi2Se3 reveal ultrafast carrier dynamics, which suggest the existence of both radiative and non-radiative recombination between electrons residing in the upper ...
Bartolo B. Di +6 more
core +3 more sources
Fabrication methods for a quantum cascade photonic crystal surface emitting laser [PDF]
, 2003 Conventional quantum cascade (QC) lasers are intrinsically edge-emitting devices with mode confinement achieved via a standard mesa stripe configuration.
Capasso, F. +9 more
core +1 more source
Sensors, 2018 A tunable laser absorption spectrometer (TLAS) was developed for the simultaneous measurement of δ13C and δD values of methane (CH4). A mid-infrared interband cascade laser (ICL) emitting around 3.27 µm was used to measure the absorption of the three ...
Teemu Kääriäinen +2 more
doaj +1 more source
Femtosecond Photoexcited Carrier Dynamics in Reduced Graphene Oxide Suspensions and Films [PDF]
, 2011 We report ultrafast response of femtosecond photoexcited carriers in single layer reduced graphene oxide flakes suspended in water as well as few layer thick film deposited on indium tin oxide coated glass plate using pump-probe differential transmission
Kamaraju, N. +3 more
core +2 more sources
Optical properties of potential-inserted quantum wells in the near infrared and Terahertz ranges
, 2016 We propose an engineering of the optical properties of GaAs/AlGaAs quantum wells using AlAs and InAs monolayer insertions. A quantitative study of the effects of the monolayer position and the well thickness on the interband and intersubband transitions,
Benchamekh, R. +6 more
core +3 more sources
Innovative mid-infrared detector concepts [PDF]
, 2016 Gas sensing is a key technology with applications in various industrial, medical and environmental areas. Optical detection mechanisms allow for a highly selective, contactless and fast detection. For this purpose, rotational-vibrational absorption bands
Hartmann, Fabian +7 more
core +2 more sources
New Opportunities in Mid-Infrared Emission Control
Sensors, 2015 Tunable laser absorption spectroscopy (TLAS) has been well accepted as a preferred measurement technique for many industrial applications in recent years, especially for in situ applications. Previously, mainly near-infrared lasers have been used in TLAS
Peter Geiser
doaj +1 more source
Applied Sciences, 2021 We determine the CO2, N2, Ar, O2 and air pressure broadening coefficients of the H35Cl P(5) absorption line at 2775.77 cm−1 in the fundamental (1←0) band using a newly developed direct tunable diode laser absorption spectroscopy (dTDLAS)-based ...
Zhechao Qu +4 more
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