Energy relaxation dynamics in ferromagnetic Co film with femtosecond transient absorption

2019 ◽  
Vol 452 ◽  
pp. 83-87
Author(s):  
Pingli Zhang ◽  
Yanhui Yang ◽  
Anmin Chen ◽  
Ying Shi ◽  
Yunpeng Wang ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Energy Relaxation ◽  
Relaxation Dynamics ◽  
Femtosecond Transient Absorption

scholarly journals Tunable Non-linear Refraction Properties and Ultrafast Excited State Dynamics of Dicyanomethylene Dihydrofuran Derivative

2020 ◽  
Vol 8 ◽  
Author(s):  
Linpo Yang ◽  
Zhongguo Li ◽  
Taihui Wei ◽  
Liming Zhou ◽  
Feng Li ◽  
...  
Keyword(s):  
Excited State ◽  
Transient Absorption ◽  
Refraction Index ◽  
Fast Response ◽  
Transient Absorption Spectroscopy ◽  
Relaxation Dynamics ◽  
Substantial Impact ◽  
Femtosecond Transient Absorption ◽  
Non Linear ◽  
Linear Optical

The third order non-linear optical response of a dicyanomethylene dihydrofuran compound (DCDHF-2V) was investigated using a Z-scan technique in picosecond and nanosecond time regimes. The results show that DCDHF-2V has excellent excited state non-linear refraction properties on both time regimes, and the non-linear refraction index is also solvent-dependent in the nanosecond regime. The excited state relaxation dynamics of DCDHF-2V were demystified via femtosecond transient absorption spectroscopy. The TA spectra reveal that the solvent viscosities have a substantial impact on the excited state relaxation of DCDHF-2V. The exotic photophysical phenomena in DCDHF-2V reported herein can shed new light on future development of small organic non-linear optical materials with large non-linear coefficients and fast response.

How photon pump fluence changes the charge carrier relaxation mechanism in an organic–inorganic hybrid lead triiodide perovskite

2016 ◽  
Vol 18 (39) ◽  
pp. 27090-27101 ◽  
Author(s):  
Piotr Piatkowski ◽  
Boiko Cohen ◽  
Samrana Kazim ◽  
Shahzada Ahmad ◽  
Abderrazzak Douhal
Keyword(s):  
Thin Film ◽  
Charge Carrier ◽  
Transient Absorption ◽  
Relaxation Mechanism ◽  
Relaxation Dynamics ◽  
Polycrystalline Thin Film ◽  
Carrier Relaxation ◽  
Inorganic Hybrid ◽  
Femtosecond Transient Absorption ◽  
Carrier Relaxation Dynamics

The fluence dependent charge carrier relaxation dynamics in a FAPbI3 polycrystalline thin film were measured using femtosecond transient absorption and terahertz spectroscopies.

Initial carrier relaxation dynamics in ion-implanted Si nanocrystals: Femtosecond transient absorption study

1998 ◽  
Vol 73 (18) ◽  
pp. 2603-2605 ◽  
Author(s):  
V. I. Klimov ◽  
Ch. J. Schwarz ◽  
D. W. McBranch ◽  
C. W. White
Keyword(s):  
Transient Absorption ◽  
Absorption Study ◽  
Relaxation Dynamics ◽  
Carrier Relaxation ◽  
Femtosecond Transient Absorption ◽  
Si Nanocrystals ◽  
Carrier Relaxation Dynamics ◽  
Ion Implanted

Electronic relaxation dynamics of PCDA-PDA studied by transient absorption spectroscopy

2016 ◽  
Vol 18 (33) ◽  
pp. 23096-23104 ◽  
Author(s):  
Joonyoung F. Joung ◽  
Junwoo Baek ◽  
Youngseo Kim ◽  
Songyi Lee ◽  
Myung Hwa Kim ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Electronic Relaxation ◽  
Relaxation Dynamics ◽  
Femtosecond Transient Absorption ◽  
Femtosecond Transient Absorption Spectroscopy ◽  
Thermochromic Properties

Spectroscopic signature of thermochromic properties of PCDA-PDA is revealed by femtosecond transient absorption spectroscopy.

Synthesis and characterization of Cu x S nanoparticles. Nature of the infrared band and charge-carrier dynamics

2000 ◽  
Vol 72 (1-2) ◽  
pp. 101-117 ◽  
Author(s):  
M. C. Brelle ◽  
C. L. Torres-Martinez ◽  
J. C. McNulty ◽  
R. K. Mehra ◽  
J. Z. Zhang
Keyword(s):  
Charge Carrier ◽  
Transient Absorption ◽  
Electronic Absorption Spectra ◽  
Casein Hydrolysate ◽  
Early Time ◽  
Steady Increase ◽  
Relaxation Dynamics ◽  
Infrared Band ◽  
Additional Absorption ◽  
Femtosecond Transient Absorption

CuxS (x = 1,2) nanoparticles have been synthesized utilizing different capping molecules including polyethyleneglycol (PEG), polyvinylpyrrolidone (PVP), casein hydrolysate-enzymatic (CAS), and bovine serum albumin (BSA). The ground-state electronic absorption spectra of the CuxS nanoparticles show three distinct types of CuxS formed: a green type assigned as crystalline CuS, and two brown types assigned as crystalline Cu2S and amorphous Cu2S. The brown types exhibit a steady increase in absorption toward shorter wavelengths starting at around 650 nm, while the green type shows the same steady increase in absorption, but with an additional absorption band in the infrared (IR). The IR band is attributed to an electron-acceptor state lying within the bandgap. ESR measurements of free Cu(II) ions in solution for all samples show the presence of Cu(II) in the brown amorphous samples, but not in the green or brown crystalline samples. Ultrafast dynamics of photoinduced electrons have been measured for all samples using femtosecond-transient absorption/bleach spectroscopy. In all brown Cu2S samples studied, the early time-transient profiles feature a pulse-width-limited (<150 fs) rise followed by a fast decay (1.1 ps) and a slow decay (>80 ps). These decay dynamics were found to be independent of pump power and stabilizing agent. The fast 1.1 ps decay is attributed to charge carrier trapping, while the long decay may be due to either recombination or deep trapping of the charge carriers. The green CuxS samples studied showed interesting power-dependent behavior. At low excitation intensities, the green CuxS samples showed a transient bleach signal, while at high intensities, a transient absorption signal has been observed. The increased transient absorption over bleach at high intensities is attributed to trap-state saturation. A kinetic model has been developed to account for the main features of the electronic relaxation dynamics.

Sensitization of TiO2 nanoparticles in micro-emulsion by photo-excited dye molecules: A femtosecond transient absorption study

2009 ◽  
Vol 204 (2-3) ◽  
pp. 209-216 ◽  
Author(s):  
Madhab C. Rath ◽  
Dipak K. Palit ◽  
Tulsi Mukherjee ◽  
Hirendra N. Ghosh
Keyword(s):  
Tio2 Nanoparticles ◽  
Transient Absorption ◽  
Dye Molecules ◽  
Absorption Study ◽  
Femtosecond Transient Absorption ◽  
Micro Emulsion
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