Time-resolved optical study of the rotational mobility of small probe molecules in bulk polyisoprene

1989 ◽  
Vol 22 (3) ◽  
pp. 1510-1512 ◽  
Author(s):  
Patrick D. Hyde ◽  
M. D. Ediger
Keyword(s):  
Optical Study ◽  
Rotational Mobility ◽  
Probe Molecules ◽  
Time Resolved ◽  
Small Probe

Optical Study of Localized and Delocalized States in GaAsN/GaAs

2003 ◽  
Vol 798 ◽  
Author(s):  
Z. Y. Xu ◽  
X. D. Luo ◽  
X. D. Yang ◽  
P. H. Tan ◽  
C. L. Yang ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Rapid Thermal Annealing ◽  
Short Pulse ◽  
Selective Excitation ◽  
Excitation Power ◽  
Pulse Excitation ◽  
Optical Study ◽  
Time Resolved ◽  
Exciton Localization ◽  
Time Resolved Photoluminescence

ABSTRACTTaking advantages of short pulse excitation and time-resolved photoluminescence (PL), we have studied the exciton localization effect in a number of GaAsN alloys and GaAsN/GaAs quantum wells (QWs). In the PL spectra, an extra transition located at the higher energy side of the commonly reported N-related emissions is observed. By measuring PL dependence on temperature and excitation power along with PL dynamics study, the new PL peak has been identified as a transition of the band edge-related recombination in dilute GaAsN alloy and delocalized transition in QWs. Using selective excitation PL we further attribute the localized emission in QWs to the excitons localized at the GaAsN/GaAs interfaces. This interface-related exciton localization could be greatly reduced by a rapid thermal annealing.

Small Mesh Size Hydrogel for Functional Photocontrol of Encapsulated Enzymes and Small Probe Molecules

2012 ◽  
Vol 84 (3) ◽  
pp. 1374-1379 ◽  
Author(s):  
Shuhei Murayama ◽  
Fumi Ishizuka ◽  
Kaihei Takagi ◽  
Hirotaka Inoda ◽  
Akira Sano ◽  
...  
Keyword(s):  
Mesh Size ◽  
Probe Molecules ◽  
Small Probe

Analysis of Beta Amyloid Peptides Employing the Small Probe Molecules

2013 ◽  
Vol 9 (6) ◽  
pp. 1088-1091 ◽  
Author(s):  
Hyo-Bong Hong ◽  
In-Hyun Nam ◽  
Sung-Won Sohn ◽  
Ki-Bong Song
Keyword(s):  
Beta Amyloid ◽  
Probe Molecules ◽  
Amyloid Peptides ◽  
Small Probe

Time-Resolved Picosecond Optical Study of Laser-Excited Graphite

1985 ◽  
Vol 51 ◽  
Author(s):  
C. Y. Huang ◽  
A. M. Malvezzi ◽  
J. N. Liu ◽  
N. Bloembergen
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Temperature Gradient ◽  
Threshold Fluence ◽  
Optical Study ◽  
Time Resolved ◽  
High Temperature Gradient ◽  
Probe Technique ◽  
Pump And Probe ◽  
New Phase

ABSTRACTThe pump-and-probe technique is employed to perform picosecond timeresolved measurements of the reflectivity changes in highly oriented pyrolitic graphite excited by 0.532-μm pump pulses. At low pump fluences, the presence of a short-lived plasma and a high-temperature gradient gives rise to an increase in the reflectivity probed at 1.9 μm but causes a decrease at 1.064 μm. At the threshold fluence, 140 mJ/cm2, the reflectivity drops abruptly, marking a phase transformation. Above the threshold, the reflectivity drops to -0.2 from its original value of 0.42 at 1.064 μm and to -0.4 from its ambient value of 0.50 at 1.9 μm. This new phase persists only for a few nanoseconds.

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