Abstract
Second harmonic generation (SHG) is well known for giving unique information about the properties of crystals,1 thin films, surfaces, and interfaces of centrosymmetric and non-centrosymmetric materials.2 However, for isotropic materials possessing inversion symmetry (such as solutions or suspensions of the molecules of biological importance, for instance), the SHG in the bulk is forbidden in the electro-dipole approximation.1,2 This effect in the bulk arises only when quadrupole and/or magneto-dipole nonlinear susceptibilities are taken into account. Isotropic nonracemic solutions of mirror-asymmetric (chiral) molecules lack the inversion center, and nonlinear dipole susceptibilities of even orders, which are responsible for SHG nonlinear process, become nonvanishing.3
© 1997 Optical Society of America
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