TY - JOUR
T1 - Enhanced tunability of the multiphoton absorption cross-section in seeded CdSe/CdS nanorod heterostructures
AU - Xing, Guichuan
AU - Chakrabortty, Sabyasachi
AU - Chou, Kok Loong
AU - Mishra, Nimai
AU - Huan, Cheng Hon Alfred
AU - Chan, Yinthai
AU - Sum, Tze Chien
PY - 2010/8/9
Y1 - 2010/8/9
N2 - 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.
AB - 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.
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U2 - 10.1063/1.3479048
DO - 10.1063/1.3479048
M3 - Article
AN - SCOPUS:77955767637
SN - 0003-6951
VL - 97
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 6
M1 - 061112
ER -