Journal
OPTICS EXPRESS
Volume 15, Issue 26, Pages 17619-17624Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.15.017619
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It is shown that optical vortex beams can be generated from a non-vortex fundamental beam by an optical frequency conversion process taking place within a twisted nonlinear photonic crystal. This is done without any first-order (linear) refractive optics. Through such a proposed structure, all-optical switching of vortices with different helicities is made possible, as well as the simultaneous application of counter-rotating vortex beams of different frequencies. (C) 2007 Optical Society of America.
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