Detection of optical trapping of CdTe quantum dots by two-photon-induced luminescence
Detection of optical trapping of CdTe quantum dots by two-photon-induced luminescence
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DOI：
10.1103/physrevb.75.161305
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发表时间：
2007-04-01
影响因子：
3.7
通讯作者：
Tamai, Naoto
中科院分区：
文献类型：
--
作者：
Pan, Lingyun;Ishikawa, Atsushi;Tamai, Naoto
D2O 中的纳米尺寸 CdTe 量子点 (QD) 可以被输入功率低至 100 mW 的高重复率皮秒 Nd:YLF 激光器进行光学捕获。 CdTe QD 的 10(4)-10(5) GM 具有大的双光子吸收 (TPA) 截面，使得利用 TPA 诱导发光检测捕获过程成为可能。在 D2O 中，CdTe QD 的发光强度随着时间的推移而增加，而在 H2O 中明显检测到强度下降。此外，光学捕获的 CdTe QD 被固定在亲水性玻璃基板上。量子点的激光捕获可以为量子信息和生物应用提供基本技术。
Nanometer-sized CdTe quantum dots (QDs) in D2O can be optically trapped by a high repetition-rate picosecond Nd:YLF laser with an input power as low as 100 mW. A large two-photon absorption (TPA) cross section of 10(4)-10(5) GM for CdTe QDs makes it possible to detect the trapping process with TPA induced luminescence. In D2O, the luminescence intensity of CdTe QDs was found to increase with time, whereas an intensity decrease was clearly detected in H2O. In addition, the optically trapped CdTe QDs were fixed on a hydrophilic glass substrate. Laser trapping of QDs may provide a basic technique for quantum information and biological applications.