Observation and characterization of nonlinear processes in organic and biological samples by excited state absorption (ESA) spectroscopy

2005 ◽  
Author(s):  
D.v. Seggern ◽  
C. Spitz ◽  
G. Gnonvaldt ◽  
R. Menzel
Keyword(s):  
Excited State ◽  
Biological Samples ◽  
Excited State Absorption ◽  
Nonlinear Processes

scholarly journals Using pulse transit delay in Z-scan to discriminate between excited-state absorption and other nonlinear processes in ZnO nanocones

2014 ◽  
Vol 22 (6) ◽  
pp. 6222 ◽  
Author(s):  
Matthew P. Shortell ◽  
Esa A. Jaatinen ◽  
Jin Chang ◽  
Eric R. Waclawik
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Nonlinear Processes ◽  
Transit Delay

Photophysical and optical limiting properties at 532 nm of BODIPY dyes with p-benzyloxystyryl groups at the 3,5-positions

2018 ◽  
Vol 22 (05) ◽  
pp. 413-422 ◽  
Author(s):  
Bokolombe P. Ngoy ◽  
Zweli Hlatshwayo ◽  
Njemuwa Nwaji ◽  
Gertrude Fomo ◽  
John Mack ◽  
...  
Keyword(s):  
Optical Properties ◽  
Excited State ◽  
Nonlinear Optical ◽  
Heavy Atom ◽  
Excited State Absorption ◽  
Optical Limiting ◽  
Synthesis And Characterization ◽  
532 Nm ◽  
Atom Effect

The synthesis and characterization of a series of 3,5-di-[Formula: see text]-benzyloxystyrylBODIPY dyes with different substituents at the meso-aryl position is reported. The photophysical and nonlinear optical properties are described. BODIPYs of this type are found to be suitable for optical limiting at 532 nm on the nanosecond timescale. An enhancement of the population of the T[Formula: see text] state through the incorporation of bromine atoms at the 2,6-positions does not result in an enhancement of the optical limiting properties on a nanosecond timescale. This suggests that, in contrast with phthalocyanines, access to excited state absorption (ESA) from the T[Formula: see text] state through the introduction of a heavy atom effect does not provide a significantly improved reverse saturable absorbance response compared to ESA from the S[Formula: see text] state.

Synthesis and Optical Limiting Characterization of a Porphyrin-Buckminsterfullerene Dyad

1999 ◽  
Vol 561 ◽  
Author(s):  
Kenneth J. McEwan ◽  
Keith L. Lewis ◽  
How-Ghee Ang ◽  
Zhi-Heng Loh ◽  
Leng-Leng Chng ◽  
...  
Keyword(s):  
Excited State ◽  
Cross Section ◽  
Excited State Absorption ◽  
Optical Limiting ◽  
Azomethine Ylide ◽  
Absorption Cross ◽  
Model Compounds ◽  
Close Proximity ◽  
532 Nm

ABSTRACTThe optical limiting performances of donor-buckminsterfullerene (C60) dyads have hitherto been unreported. The predicted large excited state absorption cross-section of such dyads in their charge-separated states would enable them to exhibit enhanced optical limiting relative to their individual components. We report herein the synthesis and optical limiting characterization of a novel porphyrin-buckminsterfullerene dyad, in which the porphyrin and C60 moieties are held within close proximity of one another by an o-phenylene bridge. The porphyrin-C60 dyad was synthesized via 1,3-dipolar azomethine ylide cycloaddition, and was obtained in 37.0% yield. Optical limiting measurements at 532 nm using 3-ns pulses show that the limiting performance of the dyad is poorer compared to its model compounds. Possible reasons for the worsened performance of the dyad will be discussed.

scholarly journals Ion Mobility–Mass Spectrometry for Bioanalysis

Separations ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 33
Author(s):  
Xavier Garcia ◽  
Maria del Mar Sabaté ◽  
Jorge Aubets ◽  
Josep Maria Jansat ◽  
Sonia Sentellas
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Biological Samples ◽  
Ion Mobility Mass Spectrometry ◽  
Exogenous Compounds ◽  
Analytical Separation

This paper aims to cover the main strategies based on ion mobility spectrometry (IMS) for the analysis of biological samples. The determination of endogenous and exogenous compounds in such samples is important for the understanding of the health status of individuals. For this reason, the development of new approaches that can be complementary to the ones already established (mainly based on liquid chromatography coupled to mass spectrometry) is welcomed. In this regard, ion mobility spectrometry has appeared in the analytical scenario as a powerful technique for the separation and characterization of compounds based on their mobility. IMS has been used in several areas taking advantage of its orthogonality with other analytical separation techniques, such as liquid chromatography, gas chromatography, capillary electrophoresis, or supercritical fluid chromatography. Bioanalysis is not one of the areas where IMS has been more extensively applied. However, over the last years, the interest in using this approach for the analysis of biological samples has clearly increased. This paper introduces the reader to the principles controlling the separation in IMS and reviews recent applications using this technique in the field of bioanalysis.

scholarly journals Realizing Near‐Infrared Laser Dyes through a Shift in Excited‐State Absorption

2021 ◽  
pp. 2001947
Author(s):  
Reiko Aoki ◽  
Ryutaro Komatsu ◽  
Kenichi Goushi ◽  
Masashi Mamada ◽  
Soo Young Ko ◽  
...  
Keyword(s):  
Excited State ◽  
Near Infrared ◽  
Excited State Absorption ◽  
Infrared Laser ◽  
Laser Dyes
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