Phase resonances in obliquely illuminated compound gratings

Details Phase resonances in obliquely illuminated compound gratings Phase resonances in obliquely illuminated compound gratings

2005-07-14

arxiv.org/abs/physics/0507113v1

Physics

Optics

21 pages, 7 figures

Scientific paper

The existence of phase resonances in obliquely illuminated, perfectly conducting compound gratings is investigated. The diffraction problem of a p-polarized plane wave impinging on the structure is solved using the modal approach. The results show that even under oblique illumination, where no symmetry is imposed by the incident field, there are resonant wavelengths that are clearly associated with a certain degree of symmetry in the phase distribution of the magnetic field inside the cavities. New configurations of this phase distribution take place, that were not allowed under normal incidence conditions. It was found that the interior field is intensified in the resonances, and the specularly reflected efficiency is maximized. In particular, this efficiency is optimized for Littrow mount.

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