Enhanced two-photon absorption of CdS nanocrystal rods

被引：49
作者：
Li, Xiangping [1 ]
van Embden, Joel [1 ]
Chon, James W. M. [1 ]
Gu, Min [1 ]
机构：
[1] Swinburne Univ Technol, Ctr Microphoton, Fac Engn & Ind Sci, Hawthorn, Vic 3122, Australia
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 10期
基金：
澳大利亚研究理事会;
关键词：
cadmium compounds; fluorescence; II-VI semiconductors; nanostructured materials; nanotechnology; two-photon spectra; wide band gap semiconductors; EXCITATION CROSS-SECTIONS; QUANTUM RODS; SEMICONDUCTOR NANOCRYSTALS; OPTICAL NONLINEARITIES; CDTE; ULTRAFAST; PROBES;
D O I：
10.1063/1.3100196
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
In this letter we report that CdS nanocrystals are reshaped into an elongated rod form for increasing two-photon absorption. CdS quantum rods with uniform rod dimensions have been synthesized and their two-photon absorption cross section in solution has been characterized using the z-scan method and the two-photon induced fluorescence study. The absorption cross section was found to be 20.9x10(-46) cm(4)/s photon(-1) under two-photon excitation at wavelength 800 nm, which is an order of magnitude larger than that of CdS quantum dots of similar diameters. The higher two-photon absorption coefficient establishes the potential of this class of quantum rods for various photonic applications.
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页数：3
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