Planar optical lattice of TiO_2 particles

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Abstract
We present an experimental study of the formation of two-dimensional optical lattices of titanium dioxide particles. The titanium dioxide particles, with an average size of 0.24 μm and a high refractive index of 2.6–2.9 in the visible region, were trapped in the antinodes of a standing-wave field. The shortest lattice constant reached so far is 0.8 μm. A corresponding diffraction pattern of the lattice was observed. This is an effort to create a photonic crystal with a lattice constant extended to visible and near-infrared wavelength scales.