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 SiO<sub>2</sub> glass plates. The gratings were covered with a thin SiO<sub>2</sub> 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
Junji Nishii, Kenji Kintaka, and Tatsuhiro Nakazawa, "High-Efficiency Transmission Gratings Buried in a Fused-SiO2 Glass Plate," Appl. Opt. 43, 1327-1330 (2004)