High-order optical nonlinearities in nanocomposite films dispersed with semiconductor quantum dots at high concentrations

We describe the nonlinear optical properties of inorganic-organic nanocomposite films in which semiconductor CdSe quantum dots as high as 6.8 vol.% are dispersed. Open/closed Z-scan measurements, degenerate multi-wave mixing and femtosecond pump-probe/transient grating measurements are conducted. It...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-06, Vol.867 (1)
Main Authors: Tomita, Yasuo, Matsushima, Shun-suke, Yamagami, Ryu-ichi, Jinzenji, Taka-aki, Sakuma, Shohei, Liu, Xiangming, Izuishi, Takuya, Shen, Qing
Format: Article
Language:English
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Summary:We describe the nonlinear optical properties of inorganic-organic nanocomposite films in which semiconductor CdSe quantum dots as high as 6.8 vol.% are dispersed. Open/closed Z-scan measurements, degenerate multi-wave mixing and femtosecond pump-probe/transient grating measurements are conducted. It is shown that the observed fifth-order optical nonlinearity has the cascaded third-order contribution that becomes prominent at high concentrations of CdSe QDs. It is also shown that there are picosecond-scale intensity-dependent and nanosecond-scale intensity-independent decay components in absorptive and refractive nonlinearities. The former is caused by the Auger process, while the latter comes from the electron-hole recombination process.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/867/1/012011