Frequency degenerate and nondegenerate two-photon absorption spectra of semiconductor quantum dots

    Authors

    L. A. Padilha; J. Fu; D. J. Hagan; E. W. Van Stryland; C. L. Cesar; L. C. Barbosa; C. H. B. Cruz; D. Buso;A. Martucci

    Comments

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    Abbreviated Journal Title

    Phys. Rev. B

    Keywords

    OPTICAL NONLINEARITIES; CDSE NANOCRYSTALS; DOPED GLASSES; SPECTROSCOPY; CDTE; ENHANCEMENT; TRANSITIONS; ASSIGNMENT; GROWTH; Physics, Condensed Matter

    Abstract

    The frequency degenerate and nondegenerate two-photon absorption (2PA) spectra of direct band gap semiconductor quantum dots are studied. Measuring the spectra for both cases in samples of CdSe and CdTe with different quantum dot sizes and size distributions, we observe that the 2PA spectra and the 2PA coefficient are size dependent, so that smaller dots have smaller 2PA even after taking into account the volume fraction. Theory considering the mixing of the hole bands, in a k center dot p model, explains the data quite well except for the smallest dots. A comparison with the parabolic band approximation is also shown.

    Journal Title

    Physical Review B

    Volume

    75

    Issue/Number

    7

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    8

    WOS Identifier

    WOS:000244533400079

    ISSN

    1098-0121

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