CdSe 纳米粒子的尺寸依赖性多光子吸收与折射

Size dependent multiphoton absorption and refraction of CdSe nanoparticles.

作者信息

Venkatram N, Sathyavathi R, Rao D N

出版信息

Opt Express. 2007 Sep 17;15(19):12258-63. doi: 10.1364/oe.15.012258.

DOI:10.1364/oe.15.012258

PMID:19547594

Abstract

We report a systematic investigation on nonlinear optical properties of CdSe nanoparticles that are smaller as well as larger than the Bohr radius. Multiphoton absorption and nonlinear refraction properties of CdSe nanoparticles observed with 800nm wavelength and 110femtosecond Ti:Sapphire laser are presented. These nonlinear optical studies were undertaken by performing open and closed aperture Z-scan measurements. The four different sizes of CdSe nanoparticles investigated are 5nm, 10nm, 25nm and 400nm. Both the quantum dots 5nm, 10nm sizes (taking the literature value of 10.6nm as the Bohr exciton diameter) show four photon absorption (4PA), while the 25nm and 400nm show the three photon absorption (3PA) properties. All four sizes of CdSe nanoparticles show the positive nonlinear refraction (n2).

摘要

我们报告了一项关于尺寸小于和大于玻尔半径的CdSe纳米粒子非线性光学性质的系统研究。文中展示了用800nm波长和110飞秒钛宝石激光器观测到的CdSe纳米粒子的多光子吸收和非线性折射性质。这些非线性光学研究通过进行开孔和闭孔Z扫描测量来开展。所研究的四种不同尺寸的CdSe纳米粒子分别为5nm、10nm、25nm和400nm。5nm、10nm尺寸的量子点（以文献值10.6nm作为玻尔激子直径）均表现出四光子吸收（4PA），而25nm和400nm的量子点表现出三光子吸收（3PA）性质。所有四种尺寸的CdSe纳米粒子均表现出正的非线性折射（n2）。