Polaron effects on the third-order nonlinear optical susceptibility in a quantum disk

✍ Scribed by Cui-Hong Liu; Kang-Xian Guo; Chuan-Yu Chen; Ben-Kun Ma

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 278 KB
• Volume: 15
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(02)00446-0

✦ Synopsis

Theoretical investigation of polaron e ects on the third-harmonic generation due to intersubband transition in a quantum disk are presented. Contributions from the bulk longitudinal optical and the surface optical phonon modes are considered separately. The analytic expression for the third-harmonic generation is derived by using the density matrix method. The numerical calculations are performed on a typical GaAs quantum disk with di erent incident photon energy and under various disk thicknesses. The results demonstrate that the polaron e ects are quite important especially around the peak value of the third-order nonlinear optical susceptibility. The maximum (3) 3! under the parameters we choose is 7:8×10 -16 (m=V) 2 , which is around two order higher than that in the bulk GaAs.