The chiro-optical effects are measured through the spectroscopic methods typified by optical rotation (OR) and circular dichroism
(CD). The chiro-optical effect can also appear as the motion of the chiral particles illuminated by the circularly polarized light. When a
chiral nanoparticle is optically trapped using a circularly polarized laser beam, the circular polarization (CP) dependent gradient force is
expected to be induced on the particle. We investigated the CP-dependent gradient force for the three-dimensionally chiral
nanoparticles. The experimental result showed that the gradient force depended on the handedness of CP (left- or right-handed) of the
trapping light as well as on the handedness of the particle chirality. The extended aspect of the chiral optical force obtained here can
give us novel methodologies for the researches of chirality sensing, manipulation, separation, enantio-selective biological reaction.
Optical trapping of nanoparticles is realized by optical gradient force originated from the intensity gradient of light with a focused beam. It is expected that the gradient force depending on the circular polarization (CP) acts on particles with chiral structures. Here, we investigate the CP-dependent gradient force on the chiral gold nanoparticles. We found that the amplitude (dispersion of the position of the Brownian motion) depends on the handedness of the incident light in both cases of D- and L-form particles. Based on the results on the gradient force for the chiral particles, it is expected that chiral nanomaterials can be handled by the circularly polarized light.
We demonstrate here that control of local optical field near a single non-chiral gold nano-rectangle irradiated with linearly polarized light is possible from linearly polarized to nearly pure left- or right-handed circular polarization, by adjusting the angle of the incident polarization relative to the rectangle.
KEYWORDS: Polarization, Near field, Gold, Plasmons, Nanostructuring, Near field scanning optical microscopy, Near field optics, Nanostructures, Nanomaterials, Plasmonics, Optical microscopy, Polarimetry
We experimentally demonstrate that non-chiral plasmonic nanostructured materials interacting with linearly polarized
(non-chiral) light generate elliptically polarized (chiral) optical near-fields in local nano spaces around the materials.
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