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Published January 30, 2012 | Published
Journal Article Open

Optical diffraction of focused spots and subwavelength structures


We have developed a numerical diffraction tool for cases in which the incident field is a focused spot and the diffracting structure is a single structure or an aperiodic surface. Our approach uses the integral formulation to solve Maxwell's equations and is different from previously published methods in its choice of basis function. We compared numerical results with experimental measurements of the far-field intensity for a focused spot incident on an aluminum grating, and the comparison was favorable. Finally, we predict the diffraction behavior of the proposed digital video disk format for the next generation of optical disk. Our analysis shows that the reflected signal for this format has a strong dependence on the polarization of the incident light.

Additional Information

© 1997 Optical Society of America. Received August 9, 1996; revised manuscript received December 20, 1996; accepted January 2, 1997. We thank Dean Faklis and the Rochester Photonics Corporation for providing the sample used in the measurements described in this paper and Dan Wilson of the Jet Propulsion Laboratory for measurements of the grating. The research was supported, in part, by the U.S. Army Research Office and by the National Science Foundation Center for Neuromorphic Systems Engineering at the California Institute of Technology.

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