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Enhanced tunability of the multiphoton absorption cross-section in seeded CdSe/CdS nanorod heterostructures

Source: Appl. Phys. Lett. 97, 061112 (2010); doi:10.1063/1.3479048

Published 13 August 2010

EPAPS
KEYWORDS and PACS
Keywords
PACS
  • 81.05.Dz
    II-VI semiconductors: fabrication, treatment, testing and analysis
  • 78.67.Hc
    Optical properties of quantum dots
  • 78.55.Et
    Photoluminescence in II-VI semiconductors
  • YEAR: 2010
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PUBLICATION DATA
ISSN:
1553-9644 (online)
Publisher:
AIP is a member of CrossRef AIP
Guichuan Xing,1 Sabyasachi Chakrabortty,2 Kok Loong Chou,1 Nimai Mishra,2 Cheng Hon Alfred Huan,1 Yinthai Chan,2 and Tze Chien Sum1
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
2Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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
History: Received 22 March 2010; accepted 8 July 2010; published 13 August 2010
Permalink: http://link.aip.org/link/?APPLAB/97/061112/1

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