Abstract
The main limitation of second-order nonlinear optical materials is the requirement of non-centrosymmetry within the electric-dipole approximation. However, higher multipole effects (such as magnetic-dipole and electric-quadrupole) do not suffer from such restriction. Thus, multipole effects can provide an interesting path towards novel second-order materials. Although multipole effects have been already used in nanostructured materials, the design guidelines for strong multipolar responses in bulk of materials are poorly understood and such responses are difficult to address reliably in experiments.
© 2017 IEEE
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