Results 41 to 50 of about 229,074 (292)
Sensors, 2020 In this letter, a resolution enhancement and signal-to-noise ratio (SNR) improvement scheme for digital optical frequency comb (DOFC)-based Brillouin optical time-domain analysis (BOTDA) ultrafast distributed sensing employing a pump pulse array is ...
Yichang Wu +4 more
doaj +1 more source
Real-Time Megapixel Electro-Optical Imaging of THz Beams with Probe Power Normalization
Sensors, 2022 In this work, we present a simple method to improve the spatial uniformity of two-dimensional electro-optical imaging of terahertz (THz) beams. In this system, near-field THz images are captured by fully illuminating a sample using conventional optical ...
François Blanchard +2 more
doaj +1 more source
Femtosecond Demagnetization and Hot Hole Relaxation in Ferromagnetic GaMnAs
, 2008 We have studied ultrafast photoinduced demagnetization in GaMnAs via two-color time-resolved magneto-optical Kerr spectroscopy. Below-bandgap midinfrared pump pulses strongly excite the valence band, while near-infrared probe pulses reveal sub-picosecond
B. Koopmans +7 more
core +1 more source
Ultrafast optomechanical pulse picking [PDF]
Applied Physics B, 2017 Abstract State-of-the-art optical switches for coupling pulses into and/or out of resonators are based on either the electro-optic or the acousto-optic effect in transmissive elements. In high-power applications, the damage threshold and other nonlinear and thermal effects in these elements impede further improvements in pulse energy ...
Nikolai Lilienfein +2 more
openaire +3 more sources
Ultrafast Transient Holographic Microscopy
Nano Letters, 2021 Ultrafast nanoscopy remains limited to small fields-of-view due to cameras’ slow acquisition speeds. We present a wide-field transient microscope in which off-axis holography enables shot-to-shot signal demodulation irrespective of the camera frame-rate.
Matz Liebel +3 more
openaire +5 more sources
Terahertz Emission and Ultrafast Carrier Dynamics of Ar-Ion Implanted Cu(In,Ga)Se2 Thin Films
Crystals, 2021 We investigated THz emission from Ar-ion-implanted Cu(In,Ga)Se2 (CIGS) films. THz radiation from the CIGS films increases as the density of implanted Ar ions increases.
Chul Kang +6 more
doaj +1 more source
A local view on single and coupled molecules [PDF]
, 2005 The paper focuses on a novel approach to reveal ultrafast dynamics in single molecules. The main strength of the approach is towards ultrafast processes in extended multi-chromophoric molecular assemblies.
Dijk, Erik van +3 more
core +3 more sources
Toward time-resolved laser T-jump/X-ray probe spectroscopy in aqueous solutions
Structural Dynamics, 2019 Most chemical and biochemical reactions in nature and in industrial processes are driven by thermal effects that bring the reactants above the energy barrier for reaction.
O. Cannelli +9 more
doaj +1 more source
Optical and Nonlinear Optical Response of Light Sensor Thin Films
Sensors, 2005 For potential ultrafast optical sensor application, both VO2 thin films andnanocomposite crystal-Si enriched SiO2 thin films grown on fused quartz substrates weresuccessfully prepared using pulsed laser deposition (PLD) and RF co-sputteringtechniques. In
S. Z. Weisz +7 more
doaj +1 more source
Ultrafast Graphene Light Emitters [PDF]
Nano Letters, 2018 Ultrafast electrically driven nanoscale light sources are critical components in nanophotonics. Compound semiconductor-based light sources for the nanophotonic platforms have been extensively investigated over the past decades. However, monolithic ultrafast light sources with a small footprint remain a challenge.
Young Duck Kim +19 more
openaire +4 more sources