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Opt Lett. 2012 Jun 15;37(12):2391-3. doi: 10.1364/OL.37.002391.

Reconciliation of generalized refraction with diffraction theory.

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Center for Metamaterials and Integrated Plasmonics, Department of Electrical and Computer Engineering, Pratt School of Engineering, Duke University, Box 90291, Durham, North Carolina 27708, USA.


When an electromagnetic wave is obliquely incident on the interface between two homogeneous media with different refractive indices, the requirement of phase continuity across the interface generally leads to a shift in the trajectory of the wave. When a linearly position-dependent phase shift is imposed at the interface, the resulting refraction may be described using a generalized version of Snell's law. In this Letter, we establish a formal equivalence between generalized refraction and blazed diffraction gratings, further discussing the relative merits of the two approaches.


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