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
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
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.
Received: 23 November 2001
Revised: 08 January 2002
Accepted manuscript online:
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