  We predict nucleation of pancake shaped metallic nanoparticles having
plasmonic frequencies in resonance with a non-absorbed circularly polarized
electromagnetic field. We show that the same field can induce nucleation of
randomly oriented needle shaped particles. The probabilities of these shapes
are estimated vs. field frequency and strength, material parameters, and
temperature. This constitutes a quantitative model of non-photochemical laser
induced nucleation (NPLIN) consistent with the observed particle geometry. Our
results open a venue to nucleation of nanoparticles of desirable shapes
controlled by the field frequency and polarization.
