title: The empirical correlation between size and two-photon absorption cross section of CdSe and CdTe quantum dots.
abstract: 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.
authors.affiliation: Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Shih-Chieh
authors.initials: SC
authors.lastname: Pu
authors.forename: Meng-Ju
authors.initials: MJ
authors.lastname: Yang
authors.forename: Cheng-Chih
authors.initials: CC
authors.lastname: Hsu
authors.forename: Chih-Wei
authors.initials: CW
authors.lastname: Lai
authors.forename: Cheng-Chih
authors.initials: CC
authors.lastname: Hsieh
authors.forename: Sheng Hsien
authors.initials: SH
authors.lastname: Lin
authors.forename: Yi-Ming
authors.initials: YM
authors.lastname: Cheng
authors.forename: Pi-Tai
authors.initials: PT
authors.lastname: Chou
mesh_terms: D000042:Absorption; D019187:Cadmium Compounds / Q000737:chemistry*; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry; D008856:Microscopy, Fluorescence; D015233:Models, Statistical; D036103:Nanotechnology / Q000379:methods*; D010777:Photochemistry; D017785:Photons; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry*; D013691:Tellurium / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; C058667:cadmium selenide; D013691:Tellurium; C028337:cadmium telluride