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

Naga Krishnakanth Katturi; Venkata Suman Krishna Jonnadula; Chinmoy Biswas; Sai Santosh Kumar Raavi; Lingamallu Giribabu; Venugopal Rao Soma

doi:10.1117/12.2558067

1 April 2020 Ultrafast photophysical studies and femtosecond third-order nonlinear optical properties of a Soret-band excited zinc phthalocyanine

Naga Krishnakanth Katturi, Venkata Suman Krishna Jonnadula, Chinmoy Biswas, Sai Santosh Kumar Raavi, Lingamallu Giribabu, Venugopal Rao Soma

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Proceedings Volume 11365, Organic Electronics and Photonics: Fundamentals and Devices II; 113650W (2020) https://doi.org/10.1117/12.2558067
Event: SPIE Photonics Europe, 2020, Online Only

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 (S_n) 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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Naga Krishnakanth Katturi, Venkata Suman Krishna Jonnadula, Chinmoy Biswas, Sai Santosh Kumar Raavi, Lingamallu Giribabu, and Venugopal Rao Soma "Ultrafast photophysical studies and femtosecond third-order nonlinear optical properties of a Soret-band excited zinc phthalocyanine", Proc. SPIE 11365, Organic Electronics and Photonics: Fundamentals and Devices II, 113650W (1 April 2020); https://doi.org/10.1117/12.2558067

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