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Proceedings Paper

Mechanisms of ultrafast coherent all-optical polarization switch in semiconductors
Author(s): Wenfeng Wang; Min Zhai; Jun Zhang; Yong Chen; Yongchao Gan
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Paper Abstract

Within the framework of light-semiconductor interaction and the Lutting-Kohn model for the semiconductor band structure, we theoretically studied the mechanism of the polarization switch with coherent transient features. The result shows, in the coherent limitation, when the pump pulse Ep and signal pulse Es are orthogonal polarized, the third order polarization P(3), with first order of Es and second order of |Ep|, approach to zero, due to the destructive quantum interference, which results in an ultrafast pump-signal relative polarization dependent P(3), therewith a polarization switch. The study also shows that, when the light interacts with semiconductors coherently, the polarization state of the light is transferred to the relative phase of the electron spin, rather than the electron spin itself. The population of the polarization eigenstate excited by the pump pulse, do not origin from the Coulomb force of electrons, and should not thought phenomenologically as the exciton characterized by light polarization. This population will dephase to real carriers population, i.e. electron with exact spin |↑> or |↓>, by losing phase coefficients of the polarization eigenstates, in an ultrashort quantum dephase time.

Paper Details

Date Published: 20 February 2009
PDF: 8 pages
Proc. SPIE 7279, Photonics and Optoelectronics Meetings (POEM) 2008: Optoelectronic Devices and Integration, 727918 (20 February 2009); doi: 10.1117/12.823067
Show Author Affiliations
Wenfeng Wang, Hubei Univ. (China)
Min Zhai, Hubei Univ. (China)
Jun Zhang, Hubei Univ. (China)
Yong Chen, Hubei Univ. (China)
Yongchao Gan, Hubei Univ. (China)


Published in SPIE Proceedings Vol. 7279:
Photonics and Optoelectronics Meetings (POEM) 2008: Optoelectronic Devices and Integration
Liming Zhang; Michael J. O'Mahony, Editor(s)

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