title: Plane-wave diffraction at the periodically corrugated boundary of vacuum and a negative-phase-velocity material.
abstract: Considering the diffraction of a plane wave by a periodically corrugated half-space, we show that the transformation of the refracting medium from positive (negative) phase velocity to negative (positive) phase velocity type has an influence on the diffraction efficiencies. This effect increases with increasing corrugation depth, owing to the presence of evanescent waves in the troughs of the corrugated interface.
authors.affiliation: Grupo de Electromagnetismo Aplicado, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón I, 1428 Buenos Aires, Argentina. rdep@df.uba.ar
authors.forename: Ricardo A
authors.initials: RA
authors.lastname: Depine
authors.forename: Akhlesh
authors.initials: A
authors.lastname: Lakhtakia