Optical nonlinearities of fine exciton states in a CdSe quantum dot

被引：10

作者：

Je, Koo-Chul ^{[1
]}

Shin, In-Chul ^{[2
]}

Kim, Jihoon ^{[3
]}

Kyhm, Kwangseuk ^{[3
]}

机构：

[1] Anyang Univ, Coll Liberal Arts & Sci, Dept Phys, Gyeonggi Do 430714, South Korea

[2] Dankook Univ, Dept Elect Engn, Gyeonggi Do 448701, South Korea

[3] Pusan Natl Univ, Dept Phys Educ & Phys, RCDAMP, Pusan 609735, South Korea

来源：

APPLIED PHYSICS LETTERS | 2010年 / 97卷 / 10期

关键词：

BAND-EDGE; NANOCRYSTALS;

D O I：

10.1063/1.3488019

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Optical nonlinearities near the band edge exciton states in a CdSe quantum dot have been investigated. The photoinduced changes in the real and imaginary parts of the refractive index have been calculated for an injected pulse area and occupancy on the basis of the size-dependence of the fine exciton states by using semiconductor Bloch equations. We found that the optical nonlinearities are dominant in +/- 1(L). However, the gain for +/- 1(L) is compensated by absorption at the other bright exciton states (+/- 1(U) and 0(u)) for a resonantly exciting femtosecond pulse. These results were in good agreement with those obtained for a cocircularly polarized degenerate pump-probe experiment. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3488019]

引用

页数：3

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