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Transient photodarkening induced by a nanosecond pulsed laser in amorphous and liquid As2Se3: fractal characteristics in relaxation dynamics

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Abstract

Both amorphous and liquid As2Se3 exhibit fast decrease of optical transmittance under a nanosecond pulsed laser excitation. This light-induced effect is called fast photodarkening (PD). After the cessation of excitation (one shot), the PD recovers within 0.1 s, but remains in a wide time domain from 10–7 to 10–2 s. Dynamic responses of the PD-recovery are studied through the autocorrelation function (ACF) in time domain and the power spectrum (PS) in frequency domain. The first zero-crossing time in the ACF, τ0, a measure of decay time in the relaxation process, is scaled with the time interval of the original measured data, tm, with the relationship, τ0 ∝ tmγ (γ ~ 1.0) in both the amorphous and liquid states. The PS is described by 1/fα (α = 0.8–0.9). Both the ACF and PS results indicate that the structural relaxation of the As–Se network occurs with similar decay processes in “any” time region, which can be inferred to have fractal nature in time domain.

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Acknowledgements

We wish to thank the JICA-CADEFEST 2 project for the technical and financial supports and Emeritus Professor K. Tamura of Kyoto University for the permission of reuse of the Figure in Ref. [3].

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Authors and Affiliations

  1. Faculty of Engineering, Universidade Nacional Timor Lorosa’e, Hera, Timor-Leste

    Abelito F. Belo

  2. Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu, 501-9133, Japan

    K. Shimakawa

  3. Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), 162-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan

    Y. Sakaguchi

Authors
  1. Abelito F. Belo
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  2. K. Shimakawa
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  3. Y. Sakaguchi
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Contributions

Data collection was performed YS and analysis was performed by AB and KS. The first draft of the manuscript was written by AB and all authors commented on the previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Abelito F. Belo.

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Belo, A.F., Shimakawa, K. & Sakaguchi, Y. Transient photodarkening induced by a nanosecond pulsed laser in amorphous and liquid As2Se3: fractal characteristics in relaxation dynamics. J Mater Sci: Mater Electron 33, 22541–22548 (2022). https://doi.org/10.1007/s10854-022-09032-9

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  • DOI: https://doi.org/10.1007/s10854-022-09032-9

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