We describe a rigorous model for the scattering of a three-dimensional focused spot by a one-dimensional periodic grating. The incident field is decomposed into a sum of quasi-periodic fields, and the scattering of each of these is computed inside one unit cell of the grating. The model is applied to the simulation of the readout of a DVD disk. The polarization dependence of the reflected near and far fields is studied, and, for a TM-polarized incident spot, plasmons are observed in the reflected far-field intensity.
© 2003 Optical Society of America
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1970) Diffraction and gratings : Diffractive optics
(210.4590) Optical data storage : Optical disks
(210.4770) Optical data storage : Optical recording
J. M. Brok and H. P. Urbach, "Rigorous model of the scattering of a focused spot by a grating and its application in optical recording," J. Opt. Soc. Am. A 20, 256-272 (2003)