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Reverse saturable absorption dynamics in indocyanine green

Paper ID Volume ID Publish Year Pages File Format Full-Text
28142 44061 2007 4 PDF Available
Title
Reverse saturable absorption dynamics in indocyanine green
Abstract

In this work, we studied the nonlinear absorption dynamics of indocyanine green (ICG) in dimethyl sulfoxide (DMSO) at 532 nm. Single pulse and pulse train Z-scan techniques were used to obtain singlet and triplet states dynamics, which were analyzed with a three- and five-energy level diagram, respectively. The excited singlet state absorption cross-section was determined to be 75 times higher than the ground state one, giving rise to reverse saturated absorption. Reverse saturated absorption also occurs from the triplet state, after its population through an intersystem crossing process, whose characteristic time is 4 ns. The triplet state absorption cross-section determined is 31 times higher than the ground state one. The high excited singlet and triplet states absorption cross-sections of ICG indicates its use in application requiring reverse saturated absorption, such as sensitizer for photodynamic therapy and optical limiting.

Keywords
Optical limiting; Photo-sensitizer; Pulse train Z-scan technique; Nonlinear optics
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 190, Issue 1, 5 July 2007, Pages 41–44
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
You save - $31
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