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New materials for nonlinear optical applications: The nonlinear refractive index of colloidal PbSe quantum dots

par Moreels, Iwan;Kockaert, Pascal ;Thourhout, D.;Hens, Zeger
Référence , page (43-46)
Publication Publié, 2007

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Résumé :

We present a detailed study of the nonlinear optical properties of colloidal PbSe quantum dot (Q-PbSe) suspensions and thin films. The nonlinear refractive index n2 has been measured with the Z-scan technique as a function of wavelength (1.20 -- 1.75 textmum), optical intensity and nanocrystal volume fraction. The n2-spectra show negative resonances near the Q-PbSe optical transitions. We attributed the high n2 to biexciton creation within the Q-PbSe. The n2 of a close-packed thin Q-PbSe film is 6 orders of magnitude larger than values for bulk Si of GaAs at telecom wavelengths, suggesting that Q-PbSe might be a promising material for all optical signal processing.