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Role of End-Fire and Broadside Radiation in Refraction, Dispersion, and Supergain

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Abstract

By allowing complex angles of incidence and scattering in the grating equation, several types of surface modes are obtained. One of these is a forced surface wave associated with “end-fire,” and another is a “broadside” mode. Experimental data are shown which correlate these modes with dispersion phenomena in periodic dielectrics. The introduction of imaginary angles in scalar optics theory is shown to give a prediction of recent experimental supergain data.

© 1961 Optical Society of America

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