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Second harmonic generation from a collection of nanoparticles
Author(s) -
Brudny Vera L.,
Mochán W. L.,
Maytorena Jesús A.,
Mendoza Bernardo S.
Publication year - 2003
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.200303855
Subject(s) - optics , polarization (electrochemistry) , diffraction , gaussian beam , second harmonic generation , homogeneous , radiation , materials science , angular spectrum method , composite number , nanoparticle , beam (structure) , physics , nanotechnology , chemistry , laser , composite material , thermodynamics
In this paper we discuss the SH radiation produced by a composite film made up of nanosized spherical centrosymmetric homogeneous particles. Although each individual sphere is unable to radiate in the forward direction when illuminated by a plane wave, our results show that for a thin composite film illuminated by a focused gaussian linearly polarized beam the radiation pattern presents two narrow lobes displaced along the polarization direction by a small angle of the order of the diffraction‐induced angular divergence of the linear far field. The SH radiation produced by a non‐homogeneous film, on the other hand presents non‐trivial patterns which depend on the fundamental frequency, the waist of the illuminating beam, the sharpness of the edge, the density profile and both the incoming and outgoing polarizations. We hope that these results can be extended to develop characterization techniques for composite films based on surface SHG or SFG. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)