Abstract

Computer optimization shows that the first-order diffraction efficiency of a lossless-transmission surface-relief grating with a rectangular surface profile can be made very large (∼95%) simultaneously for light of TE and TM polarizations incident near the Bragg angle by the proper choice of the fill factor. The case for visible light incident close to the Bragg angle on unslanted gratings with periodicities corresponding to Bragg angles of 30°, 37.5°, and 45° is presented. The refractive index of the grating material was chosen in the range between 1.2 and 2.

© 1998 Optical Society of America

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