Abstract
We present a method for manipulating individual sites in an optical lattice which enables the creation of defects within otherwise periodic light patterns. The modified optical lattice is created by interference of plane waves and spiral phase waves. Spiral phase modulation and the optical vortices that result are well suited for addressing single rows of fringes in the lattice owing to the localized wrap of the phase front. The size and shape of local fringes can be tuned or dynamically split and recombined by controlling the relative phase of the incident waves.
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