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Observation of two-photon absorption at UV radiation in ZnS quantum dots

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Abstract

Research studies on quantum dots (QDs) of semiconductor materials are of potential interest in present days having promising applications in different optoelectronic devices. Among other materials, ZnS is a direct bandgap semiconductor material having a wide bandgap of 3.6 eV for its cubic phase at room temperature and it shows excellent optical properties. However, here the nonlinear optical (NLO) properties of chemically synthesized ZnS QDs of average size of ∼1.5 nm have been reported which are measured by using an indigenously developed Z-scan technique. The pump radiation is 355 nm which is the third harmonic of the Q-switched Nd:YAG laser radiation having pulsed duration of 10 ns with the repetition rate of 10 Hz. The measured experimental data have been analysed by using analytical models and two-photon absorption coefficients of the ZnS QDs at 355 nm have been extracted.

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Acknowledgements

Authors are grateful to DST (Grant No. SR/FTP/PS-67/2008), Govt. of India, for the partial financial support.

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Authors and Affiliations

  1. Nanoscience Laboratory, Department of Physics, National Institute of Technology, Durgapur, 713 209, India

    MANAJIT CHATTOPADHYAY & PATHIK KUMBHAKAR

  2. Laser Laboratory, Department of Physics, Burdwan University, Burdwan, 713 104, India

    UDIT CHATTERJEE

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  1. MANAJIT CHATTOPADHYAY
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  2. PATHIK KUMBHAKAR
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  3. UDIT CHATTERJEE
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Correspondence to PATHIK KUMBHAKAR.

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CHATTOPADHYAY, M., KUMBHAKAR, P. & CHATTERJEE, U. Observation of two-photon absorption at UV radiation in ZnS quantum dots. Pramana - J Phys 82, 327–330 (2014). https://doi.org/10.1007/s12043-014-0685-x

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  • DOI: https://doi.org/10.1007/s12043-014-0685-x

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