The case of layered two-phase nanocomposites has been numerically studied. Contrary to the earlier studies on the subject, material's susceptibilities are allowed to be complex valued and to change as a function of frequency. Thereby, new effects arise, e.g., the phase of the effective third-order susceptibility (chi) _eff⁽³) of a nanocomposite can have a huge frequency dependent increase near resonances compared to corresponding phase changes of (chi) ⁽³) of the constituent materials. Unfortunately, the phase changes cannot be predicted from the amplitude measurement (chi) _eff⁽³) by the Kramers-Kronig methods, because (chi) _eff⁽³) is, in general, a meromorphic function in a complex frequency plane, and thus, conventional Kramers- Kronig relation does not exist between the amplitude and phase of (chi) _eff⁽³). In this paper another type of phase retrieval procedure, based on the maximum entropy model, is shown to be applicable for (chi) _eff⁽³).

Date Published: 7 May 1999
PDF: 4 pages
Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347838

Published in SPIE Proceedings Vol. 3740:
Optical Engineering for Sensing and Nanotechnology (ICOSN '99)
Ichirou Yamaguchi, Editor(s)