Ultrafast photophysical studies and femtosecond third-order nonlinear optical properties of a Soret-band excited zinc phthalocyanine

Katturi, Naga Krishnakanth and Jonnadula, Venkata Suman Krishna and Biswas, Chinmoy and Raavi, Sai Santosh Kumar and Giribabu, Lingamallu and Soma, Venugopal Rao and Reineke, Sebastian and Vandewal, Koen and Maes, Wouter (2020) Ultrafast photophysical studies and femtosecond third-order nonlinear optical properties of a Soret-band excited zinc phthalocyanine. In: Organic Electronics and Photonics: Fundamentals and Devices II 2020, 6 April 2020 - 10 April 2020.

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Abstract

Herein, results from the investigation of ultrafast photophysical and third-order nonlinear optical properties of newly synthesized Zn phthalocyanine, namely [Zinc (II) 2,10,16,24tetrakis(2,6-dichloropyridin-3-yl) phthalocyanine, PyCl2PC] molecule are presented. The photophysical properties were studied using femtosecond transient absorption spectroscopy while the NLO properties were measured using the single beam Z-scan and degenerate four-wave mixing (DFWM) techniques. The transient absorption spectra were obtained at 400 nm photoexcitation and a white light continuum probed the corresponding dynamics from (440-780 nm) in the solution phase. The obtained transient absorption spectra were globally fitted using a kinetic model which yielded the different photophysical constants after photoexcitation such as (i) internal conversion from higher electronic excited state (Sn) to lower electronic state (S1) happening in 1 ps (ii) Vibrational relaxation (6.25 ps) occurring within the S1 states (III) Intersystem crossing (1.78 ns) (IV) relaxation from the triplet states to ground state (0.11 μs). Nonlinear absorption properties were measured at 800 nm wavelength utilizing ∼70 fs, 1 kHz laser pulses in the solution phase. A large two-photon absorption coefficient (β) of ∼8×10-13 cm/W was obtained and the corresponding cross-section was estimated to be 659 GM. Time-resolved degenerate four-wave-mixing measurements revealed a large magnitude and an ultrafast response of χ(3).

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IITH Creators:
IITH CreatorsORCiD
Biswas, ChinmoyUNSPECIFIED
Raavi, Sai Santosh Kumarhttp://orcid.org/0000-0002-2496-9233
Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Degenerate four-wave mixing; NLO; Phthalocyanines; Transient absorption; Z-Scan
Subjects: Physics
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 07 Jul 2021 09:08
Last Modified: 07 Jul 2021 09:08
URI: http://raiith.iith.ac.in/id/eprint/8159
Publisher URL: http://doi.org/10.1117/12.2558067
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