中国物理B ›› 2002, Vol. 11 ›› Issue (6): 601-607.doi: 10.1088/1009-1963/11/6/316

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Optical responses of dilute anisotropic composites: numerical calculations via Green's function formalism

余建华1, 古英2   

  1. (1)Department of Physics, the Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China; (2)State Key Laboratory for Mesoscopic Physics & Department of Physics, Peking University, Beijing 100871, China; Department of Physics, the Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
  • 收稿日期:2001-11-23 修回日期:2002-01-08 出版日期:2002-06-12 发布日期:2005-06-12

Optical responses of dilute anisotropic composites: numerical calculations via Green's function formalism

Gu Ying (古英)ab, Yu Kin-Wah (余建华)b   

  1. a State Key Laboratory for Mesoscopic Physics & Department of Physics, Peking University, Beijing 100871, China; b  Department of Physics, the Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
  • Received:2001-11-23 Revised:2002-01-08 Online:2002-06-12 Published:2005-06-12

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摘要： We investigate the linear and nonlinear optical responses of dilute anisotropic networks using Green's function formalism [Gu Y et al 1999 Phys. Rev. B 59 12847]. For different applied fields, numerical calculations indicate that a large third-order nonlinear enhancement and a broad infrared absorption arise from the geometric anisotropy. We also show the overlap and separation between the absorption peak and nonlinear enhancement peak when the applied field is parallel and perpendicular to the anisotropy, respectively. The results can be understood in terms of the inverse participation ratios with q=2 and the spectral distribution of optical responses.

Abstract: We investigate the linear and nonlinear optical responses of dilute anisotropic networks using Green's function formalism [Gu Y et al 1999 Phys. Rev. B 59 12847]. For different applied fields, numerical calculations indicate that a large third-order nonlinear enhancement and a broad infrared absorption arise from the geometric anisotropy. We also show the overlap and separation between the absorption peak and nonlinear enhancement peak when the applied field is parallel and perpendicular to the anisotropy, respectively. The results can be understood in terms of the inverse participation ratios with q=2 and the spectral distribution of optical responses.

Key words: response to electromagnetic fields, composites

中图分类号:  (Optical susceptibility, hyperpolarizability)

  • 42.65.An
02.30.Hq (Ordinary differential equations) 02.10.Ud (Linear algebra)