期刊
OPTICS AND LASER TECHNOLOGY
卷 84, 期 -, 页码 87-93出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2016.05.009
关键词
Semiconductor; Quantum dot; Z-scan; Nonlinear absorption; Optical limiting
资金
- Department of Science and Technology, India
The semiconductor nanocrystals are found to be promising class of third order nonlinear optical materials because of quantum confinement effects. Here, we highlight the nonlinear optical switching and optical limiting of cadmium selenide (CdSe) quantum dots (QDs) using nanosecond Z-scan measurement. The intensity dependent nonlinear absorption and nonlinear refraction of CdSe QDs were investigated by applying the Z-scan technique with 532 nm, nanosecond laser pulses. At lower intensities, the nonlinear process is dominated by saturable absorption (SA) and it is changed to reverse saturable absorption (RSA) at higher intensities. The SA behaviour is attributed to the ground state bleaching and the RSA is ascribed to free carrier absorption (FCA) of CdSe QDs. The nonlinear optical switching behaviour and reverse saturable absorption makes CdSe QDs are good candidate for all-optical device and optical limiting applications. (C) 2016 Elsevier Ltd. All rights reserved.
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