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Volume 17,     Number 3,     Fall 2009

 

A STUDY OF ANOMALOUS SCATTERING
FROM LAMELLAR DIFFRACTION GRATINGS
MICHAEL C. HASLAM

Abstract. In this paper we report on new anomalous scattering behaviour from common lamellar diffraction gratings. Numerical results are generated by our recently-developed solvers which enable the fast and accurate simulation of electromagnetic scattering from deep multi-valued periodic surfaces containing corner singularities. The well-known Wood-Rayleigh anomalies which may strongly influence scattering, particularly in the case of TM (vertical) polarization, occur at fixed wavelengths determined by the period of the surface and the direction and wavelength of the incident radiation. We demonstrate the presence of other anomalies which do not occur at the Wood-Rayleigh wavelengths and may play a dominant role in the scattering process. We show that the wavelengths at which these poorly-understood anomalies occur are determined by the geometrical features of the surface.

 

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