We study the transmission properties of a one-dimensional array with intersite side-coupled defect and demonstrate that, as the system undergoes sharp Fano resonance, it exhibits geometry-induced vorticity of the energy flux. The optical vortex inverts its handedness at the Fano resonance, revealing a strong link between two phenomena, both being of interference origin. Our approach is quite general and can be applied to a variety of systems; as an example we demonstrate a similar effect in photonic crystal structure.
© 2012 Optical Society of America
Original Manuscript: October 16, 2012
Manuscript Accepted: November 5, 2012
Published: November 30, 2012
Yi Xu, Andrey E. Miroshnichenko, and Anton S. Desyatnikov, "Optical vortices at Fano resonances," Opt. Lett. 37, 4985-4987 (2012)