Emission and reflection of light by a corrugated section of a waveguide

An investigation was made of resonant reflection of a surface wave and simultaneous coupling of light out of a corrugated section of a waveguide with a period equal to the wavelength of light in the waveguide. It was found theoretically and experimentally that the reflection coefficient could be close to unity. The ratio of the power coupled out of the corrugated section to the power incident on that section was highest when the reflection coefficient was ~ 0.3–0.4. An efficient method for making contact between a miniature laser and a corrugated section of a thin-film waveguide was tested experimentally.