Abstract

Both the surface and bulk nonlinear responses of a single centrosymmetric nanosphere excited by tightly focused cylindrical vector beams with different polarization rotation angles are investigated theoretically. The numerical results show that a distinctive feature of the calculated surface second harmonic (SH) radiation angular patterns is the possibility of strong scattering in the backward direction. In addition, when the polarization rotation angle takes a larger value, there is a distinct difference between the bulk SH responses stemming from different bulk nonlinear parameters. Those properties are in contrast to what was found in previous theories of SH light scattering from centrosymmetric nanospheres excited by tightly focused linearly polarized beams.

© 2012 Optical Society of America

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