Picosecond dynamic of aqueous sodium-copper chlorophyllin solution: An excited state absorption study

Author(s)

Sciuti, L. F. ^[1] ; Cocca, L. H. Z. ^[2] ; Caires, A. R. L. ^[3] ; Goncalves, P. J. ^{[4, 5]} ; de Boni, L. ^{[2, 1]}

Affiliation

^[1] Univ Sao Paulo, Escola Engn Sao Carlos, Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil

^[3] Univ Fed Mato Grosso do Sul, Inst Fis, Campo Grande, MS - Brazil

^[4] Univ Fed Goias, Inst Fis, Goiania, Go - Brazil

^[5] Univ Fed Goias, Inst Quim, Goiania, Go - Brazil

• Document type: Journal article
• Source: Chemical Physics Letters; v. 706, p. 652-657, AUG 16 2018.
• Web of Science Citations: 1

Abstract

This work reports on the singlet excited-state absorption spectrum of sodium-copper chlorophyllin using three distinct methods of Z-Scan measurement: white-light continuum Z-Scan technique ranging from 470 to 780 nm, tunable Z-Scan technique with femtosecond pulses (490-700 nm) and 532 nm Z-Scan technique with 100 ps pulse width. A transition from reverse saturation absorption (RSA) to saturable absorption (SA) was observed at 570 nm, and at 532 nm RSA was tested showing potential application as optical limiting device. Pump-probe technique was used to measure lifetime of the first singlet excited state (22 ps) and no evidence of triplet conversion was observed. (C) 2018 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 16/20886-1 - Ultrafast nonlinear optical spectroscopy: Transient Absorption and optical Kerr Gate with polarization control
• Grantee: Leonardo de Boni
• Support Opportunities: Regular Research Grants