Band-specific phase engineering for curving and focusing light in waveguide arrays

Chremmos, Ioannis and Efremidis, Nikolaos K. (2012) Band-specific phase engineering for curving and focusing light in waveguide arrays. Physical Review A, American Physical Society, 85 (063830). ISSN 1050-2947

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Band specific design of curved light caustics and focusing in optical waveguide arrays is introduced. Going beyond the discrete, tight-binding model, which we examined recently, we show how the exact band structure and the associated diffraction relations of a periodic waveguide lattice can be exploited to phase-engineer caustics with predetermined convex trajectories or to achieve optimum aberration-free focal spots. We numerically demonstrate the formation of convex caustics involving the excitation of Floquet-Bloch modes within the first or the second band and even multi-band caustics created by the simultaneous excitation of more than one bands. Interference of caustics in abruptly autofocusing or collision scenarios are also examined. The experimental implementation of these ideas should be straightforward since the required input conditions involve phase-only modulation of otherwise simple optical wavefronts. By direct extension to more complex periodic lattices, possibilities open up for band specific curving and focusing of light inside 2D or even 3D photonic crystals.

Item Type: Article
Subjects: Q Science > QC Physics
Depositing User: Dr Ioannis Chremmos
Date Deposited: 13 Jul 2012 14:56
Last Modified: 26 Apr 2018 13:55

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