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The Empirical Correlation Between Size and Two‐Photon Absorption Cross Section of CdSe and CdTe Quantum Dots
Author(s) -
Pu ShihChieh,
Yang MengJu,
Hsu ChengChih,
Lai ChihWei,
Hsieh ChengChih,
Lin Sheng Hsien,
Cheng YiMing,
Chou PiTai
Publication year - 2006
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200600157
Subject(s) - quantum dot , cadmium telluride photovoltaics , two photon absorption , absorption (acoustics) , absorption cross section , materials science , cross section (physics) , photon , excitation , exciton , molecular physics , optoelectronics , condensed matter physics , physics , optics , quantum mechanics , laser , composite material
The tuning of CdSe quantum dot (QDs) sizes, and consequently their corresponding two‐photon absorption (TPA) cross section, has been systematically investigated. As the size (diameter) of the quantum dots increases, the TPA cross section is found to be empirically related via a power‐law proportionality of 3.5±0.5 and 5.6±0.7 to the diameters of CdSe and CdTe QDs, respectively. The results are tentatively rationalized via a theoretical model of two‐photon excitation properties in a system incorporating excitons and defects.