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Title: Enhanced tunability of the multiphoton absorption cross-section in seeded CdSe/CdS nanorod heterostructures
Authors: Xing, G.
Chakrabortty, S.
Chou, K.L.
Mishra, N.
Huan, C.H.A.
Chan, Y. 
Sum, T.C.
Issue Date: 9-Aug-2010
Citation: Xing, G., Chakrabortty, S., Chou, K.L., Mishra, N., Huan, C.H.A., Chan, Y., Sum, T.C. (2010-08-09). Enhanced tunability of the multiphoton absorption cross-section in seeded CdSe/CdS nanorod heterostructures. Applied Physics Letters 97 (6) : -. ScholarBank@NUS Repository.
Abstract: We present a method to separately tune the multiphoton absorption (MPA) and multiphoton excited photoluminescence using semiconductor core/enlarged-shell quantum dots (QDs), where the enlarged shell greatly enhances the MPA cross-sections while varying the core size facilitates emission wavelength selectivity. Following two-photon absorption (2PA) primarily in the shell and ultrafast charge-carrier localization to the core, luminescence occurs. We exemplify the validity of this method with CdSe/CdS nanorod heterostructures and find that the 2PA cross-section is enlarged to ∼1.4× 106 GM for 180 nm nanorods (with 800 nm, 150 fs laser pulse excitation) which is two to four orders larger than that of CdSe QDs. © 2010 American Institute of Physics.
Source Title: Applied Physics Letters
ISSN: 00036951
DOI: 10.1063/1.3479048
Appears in Collections:Staff Publications

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