Picosecond Time-Resolved Resonant Two-Photon Absorption in Cu2O

1980 ◽  
pp. 294-297
Author(s):  
A. Migus ◽  
J. L. Martin ◽  
R. Astier ◽  
A. Antonetti ◽  
D. Hulin ◽  
...  
Keyword(s):  
Photon Absorption ◽  
Time Resolved ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Two-Photon Time-Gated In Vivo Imaging of Dihydrolipoic-Acid-Decorated Gold Nanoclusters

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7744
Author(s):  
Ye Tian ◽  
Ming Wei ◽  
Lijun Wang ◽  
Yuankai Hong ◽  
Dan Luo ◽  
...  
Keyword(s):  
In Vivo Imaging ◽  
Gold Nanoclusters ◽  
Photon Absorption ◽  
Gold Nanocluster ◽  
Time Resolved ◽  
Dihydrolipoic Acid ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Time Resolved Imaging

Due to the unique advantages of two-photon technology and time-resolved imaging technology in the biomedical field, attention has been paid to them. Gold clusters possess excellent physicochemical properties and low biotoxicity, which make them greatly advantageous in biological imaging, especially for in vivo animal imaging. A gold nanocluster was coupled with dihydrolipoic acid to obtain a functionalized nanoprobe; the material displayed significant features, including a large two-photon absorption cross-section (up to 1.59 × 105 GM) and prolonged fluorescence lifetime (>300 ns). The two-photon and time-resolution techniques were used to perform cell imaging and in vivo imaging.

scholarly journals Ultrafast processes triggered by one- and two-photon excitation of a photochromic and luminescent hydrazone

2019 ◽  
Vol 15 ◽  
pp. 2438-2446 ◽  
Author(s):  
Alessandro Iagatti ◽  
Baihao Shao ◽  
Alberto Credi ◽  
Barbara Ventura ◽  
Ivan Aprahamian ◽  
...  
Keyword(s):  
Excited State ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Transient Absorption ◽  
Solvent Polarity ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Time Resolved ◽  
Two Photon Absorption ◽  
Two Photon

In this work we apply a combination of steady state and time resolved luminescence and absorption spectroscopies to investigate the excited-state dynamics of a recently developed molecular photoswitch, belonging to the hydrazone family. The outstanding properties of this molecule, involving fluorescence toggling, bistability, high isomerization quantum yield and non-negligible two-photon absorption cross section, make it very promising for numerous applications. Here we show that the light induced Z/E isomerization occurs on a fast <1 ps timescale in both toluene and acetonitrile, while the excited state lifetime of the Z-form depends on solvent polarity, suggesting a partial charge transfer nature of its low lying excited state. Time-resolved luminescence measurements evidence the presence of a main emission component in the 500–520 nm spectral range, attributed to the Z-isomer, and a very short living blue-shifted emission, attributed to the E-isomer. Finally, transient absorption measurements performed upon far-red excitation are employed as an alternative method to determine the two-photon absorption cross-section of the molecule.

Ultrafast pump-probe and time-resolved fluorescence anisotropy study of the intramolecular interaction of branched styryl derivatives based on 1,3,5-triazine

2019 ◽  
Vol 28 (01) ◽  
pp. 1950003 ◽  
Author(s):  
Yaochuan Wang ◽  
Yizhuo Wang ◽  
Guiqiu Wang ◽  
Dajun Liu
Keyword(s):  
Fluorescence Anisotropy ◽  
Intramolecular Interaction ◽  
Intramolecular Interactions ◽  
Photon Absorption ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Pump Probe ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Property Measurement

A series of branched styryl derivatives based on 1,3,5-triazine were studied by nonlinear optical property measurement, degenerated pump-probe, and time-resolved fluorescence anisotropy methods to elucidate the two-photon absorption (TPA) properties and intramolecular interactions between branches. Significant enhancement of the TPA cross-section was observed in multi-branched derivatives. The anisotropy of multi-branched compounds shows faster decay and small residual values, indicating strong intramolecular interactions between branches, which further confirmed the TPA enhancement mechanism.

Pulsewidth dependence of time‐resolved two‐photon absorption with picosecond pump–probe excitation

1992 ◽  
Vol 71 (5) ◽  
pp. 2102-2105 ◽  
Author(s):  
Yasuo Tomita ◽  
Masa‐aki Shibata ◽  
Johan Bergquist
Keyword(s):  
Photon Absorption ◽  
Time Resolved ◽  
Pump Probe ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Two-Photon Absorption and Time-Resolved Stimulated Emission Depletion Spectroscopy of a New Fluorenyl Derivative

ChemPhysChem ◽  
2012 ◽  
Vol 13 (15) ◽  
pp. 3481-3491 ◽  
Author(s):  
Kevin D. Belfield ◽  
Mykhailo V. Bondar ◽  
Alma R. Morales ◽  
Xiling Yue ◽  
Gheorghe Luchita ◽  
...  
Keyword(s):  
Stimulated Emission ◽  
Photon Absorption ◽  
Time Resolved ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Stimulated Emission Depletion

scholarly journals Two-Photon Photodynamic Therapy by Water-Soluble Self-Assembled Conjugated Porphyrins

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Kazuya Ogawa ◽  
Yoshiaki Kobuke
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Cross Section ◽  
Water Soluble ◽  
Photon Absorption ◽  
Time Resolved ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Luminescence Measurement ◽  
Water Soluble Porphyrin

Studies on two-photon absorption (2PA) photodynamic therapy (PDT) by using three water-soluble porphyrin self-assemblies consisting of ethynylene-linked conjugatedbis(imidazolylporphyrin) are reviewed. 2PA cross-section values in water were obtained by an open aperture Z-scan measurement, and values were extremely large compared with those of monomeric porphyrins such as hematoporphyrin. These compounds were found to generate singlet oxygen efficiently upon one- as well as two-photon absorption as demonstrated by the time-resolved luminescence measurement at the characteristic band of singlet oxygen at 1270 nm and by using its scavenger. Photocytotoxicities for HeLa cancer cells were examined and found to be as high as those of hematoporphyrin, demonstrating that these compounds are potential candidates for 2PA-photodynamic therapy agents.

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