Direct observation of three-photon resonance in water-soluble ZnS quantum dots

Jun He, Gregory D. Scholes, Yu Long Ang, Wei Ji, Cyrus W.J. Beh, Wee Shong Chin

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

We report on large three-photon absorption (3PA) in thioglycol-capped ZnS semiconductor quantum dots (QDs) at different wavelengths with femtosecond Z-scan technique. Both the intrinsic 3PA coefficients and cross sections of the 1.3 nm sized ZnS QDs in aqueous solution are nearly one order of magnitude greater than that of ZnS bulk crystal. The 3PA resonance in ZnS QDs is observed at the lowest excitonic transition of 1S (e) -1 S32 (h).

Original languageEnglish (US)
Article number131114
JournalApplied Physics Letters
Volume92
Issue number13
DOIs
StatePublished - Apr 10 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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