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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 15 — Jul. 20, 2009
  • pp: 13140–13150

Shape-dependent two-photon absorption in semiconductor nanocrystals

Xiaobo Feng and Wei Ji  »View Author Affiliations

Optics Express, Vol. 17, Issue 15, pp. 13140-13150 (2009)

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We report our theoretical investigation onto the shape dependence of two-photon absorption (TPA) in semiconductor nanocrystals (NCs). Based on a four-band model under effective mass approximation, we have developed a simple analytical theory capable of providing a quantitative explanation of the recent TPA measurement on CdS nanorods [Appl. Phys. Lett. 94, 103117 (2009)]. With this theory, we have systematically revealed the characteristics of TPA in CdSe and ZnO NCs with four different shapes: sphere, cube, cylinder and cuboid. Due to the splitting of degenerate energy levels caused by the decreased degree of symmetry, nanocuboids and nanocubes exhibit greater TPA cross-sections than nanocylinders and nanospheres of similar sizes, respectively. Similarly, nanocuboids and nanocylinders possess larger TPA cross-sections than nanocubes and nanospheres of similar lateral dimension, respectively. Given TPA-allowed transitions, nanocuboids show stronger size dependence than nanocylinders. The size dependence of TPA cross-section is more sensitive to the lateral size than the longitudinal size in the cases of nanocylinders and nanocuboids.

© 2009 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(190.5970) Nonlinear optics : Semiconductor nonlinear optics including MQW

ToC Category:
Nonlinear Optics

Original Manuscript: June 1, 2009
Revised Manuscript: July 12, 2009
Manuscript Accepted: July 12, 2009
Published: July 16, 2009

Xiaobo Feng and Wei Ji, "Shape-dependent two-photon absorption in semiconductor nanocrystals," Opt. Express 17, 13140-13150 (2009)

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