  We optically trap freestanding single metallic chiral nanoparticles using a
standing-wave optical tweezer. We also incorporate within the trap a
polarimetric setup that allows to perform in situ chiral recognition of single
enantiomers. This is done by measuring the S_3 component of the Stokes vector
of a light beam scattered off the trapped nanoparticle in the forward
direction. This unique combination of optical trapping and chiral recognition,
all implemented within a single setup, opens new perspectives towards the
control, recognition, and manipulation of chiral objects at nanometer scales.
