標題: Resonant optical nonlinearity of conjugated polymers
作者: Chang, MC
Meng, HF
物理研究所
Institute of Physics
公開日期: 15-Nov-1997
摘要: When the energy of a pump wave is in resonance with the exciton creation energy, the electric susceptibility of a conjugated polymer in response to the probe wave is altered by the exciton gas. In this paper we calculate the dependence of this change on the exciton populations by the equation of motion (EOM) method. The magnitude of optical nonlinearity is also influenced by ambient temperature, by the extent of exciton wave functions, and by the strength of electron-electron interaction. All of these factors can be easily incorporated in the EOM approach systematically. Using the material parameters for polydiacetylene, the optical Ken coefficient n(2) obtained is about 10(-8) cm(2)/W, which is close to experimental value, and is four orders of magnitude larger than the value in nonresonant pump experiments.
URI: http://dx.doi.org/10.1103/PhysRevB.56.12277
http://hdl.handle.net/11536/149689
ISSN: 0163-1829
DOI: 10.1103/PhysRevB.56.12277
期刊: PHYSICAL REVIEW B
Volume: 56
Issue: 19
起始頁: 12277
結束頁: 12284
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