Departmental Papers (ESE)


We show that the powerful framework of transformation optics may be exploited for engineering the nonlocal response of artificial electromagnetic materials. Relying on the form-invariant properties of coordinate-transformed Maxwell’s equations in the spectral domain, we derive the general constitutive “blueprints” of transformation media yielding prescribed nonlocal field-manipulation effects and provide a physically incisive and powerful geometrical interpretation in terms of deformation of the equifrequency contours. In order to illustrate the potentials of our approach, we present an example of application to a wave-splitting refraction scenario, which may be implemented via a simple class of artificial materials. Our results provide a systematic and versatile framework which may open intriguing venues in dispersion engineering of artificial materials.

Document Type

Journal Article

Date of this Version



Castaldi, G., Galdi, V., Alù, A., & Engheta, N. (2012). Nonlocal Transformation Optics. Physical Review Letters, 108(6), 063902. doi: 10.1103/PhysRevLett.108.063902

© 2012 American Physical Society



Date Posted: 28 March 2012

This document has been peer reviewed.