Abstract

Binary gratings were fabricated with high first-order diffraction efficiency by conventional electron-beam drawing and subsequent inductive coupled-plasma dry etching upon the surfaces of SiO₂ glass plates. The gratings were covered with a thin SiO₂ film by plasma-enhanced chemical-vapor deposition without the grooves’ being filled in. The buried gratings exhibited first-order diffraction efficiencies of 84% for transverse-electric and 87% for transverse-magnetic polarized light at a wavelength of 1.55 μm when the period and the depth were 1.5 and 2.8 μm, respectively.

© 2004 Optical Society of America

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