Abstract
Here we show, analytically and numerically, that in a double-groove grating with two different groove widths per period attached on the substrate, the normally incident light couples to the st-order transmission with 96.9% efficiency and with a diffraction angle that is larger than the –air interface critical angle. Modal anal ysis reveals that three propagating modes for the st diffraction order reach the grating back end in phase, while the corresponding propagating modes for the st and zeroth orders are added destructively at the grating end. Four optical devices based on this grating characteristic are numerically demonstrated.
© 2010 Optical Society of America
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