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Second and third harmonic generations in random composites of spheroidal particles
Author(s) -
Liu Bo,
Gao Lei
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200440003
Subject(s) - decoupling (probability) , second harmonic generation , nonlinear system , representation (politics) , materials science , nonlinear optical , composite material , physics , mathematical analysis , optics , mathematics , quantum mechanics , laser , control engineering , politics , political science , law , engineering
Abstract With the aid of the spectral representation and decoupling approximation, we investigate the effective optical susceptibilities for second harmonic generation (SHG) and third harmonic generation (THG) of nonlinear composites media, in which the nonlinear spheroidal particles are embedded in a linear host medium. We emphasize the effect of the granular shape on SHG and THG susceptibilities in two types of microstructures corresponding to those described by the generalized Maxwell–Garnett Theory (MGT) and Effective Medium Approximation (EMA). Numerical results show that large enhancement of SHG and THG can be achieved by the adjustment of the depolarization factor (or the granular shape). (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)