  We present the first experimental demonstration of zero backscattering from
nanoparticles at op- tical frequencies as originally discussed by Kerker et.
al. [M. Kerker, D. Wang, and C. Giles, J. Opt. Soc. A 73, 765 (1983)]. GaAs
pillars were fabricated on a fused silica substrate and the spectrum of the
backscattered radiation was measured in the wavelength range 600-1000 nm.
Suppression of backscattering occurred at ~725 nm, agreeing with calculations
based on the discrete dipole approximation. Particles with zero backscattering
provide new functionality for metamaterials and optical antennas.
