Electromagnetic versus scalar theory for modeling diffraction gratings: is electromagnetic modeling necessary for practical applications?

Michel Neviere

doi:10.1117/12.221237

22 September 1995 Electromagnetic versus scalar theory for modeling diffraction gratings: is electromagnetic modeling necessary for practical applications?

Michel Neviere

Author Affiliations +

Proceedings Volume 2532, Application and Theory of Periodic Structures; (1995) https://doi.org/10.1117/12.221237
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

A critical analysis of grating behavior is presented over the entire spectrum, from millimeter waves to X rays. It concerns bare gratings used in resonance domain, VUV and XUV gratings used under near normal incidence, soft X-rays gratings used under grazing incidence, multilayer gratings and echelles for X rays, infrared and visible echelles, and transmission gratings. Polarization effects are pointed out and comparison between scalar theory and electromagnetic theory productions are done. It is shown that even under circumstances in which the wavelength-to-groove spacing ratio is less than 0.001, scalar theory can give erroneous predictions. The conclusion is that although scalar theory brings some physical insight and can be used as a starting point in optimizing a grating device, an accurate modelling should be made with the electromagnetic theory as a tool.

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Michel Neviere "Electromagnetic versus scalar theory for modeling diffraction gratings: is electromagnetic modeling necessary for practical applications?", Proc. SPIE 2532, Application and Theory of Periodic Structures, (22 September 1995); https://doi.org/10.1117/12.221237

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