Angular bandpass filters based on dielectric resonant waveguide gratings

作者：Steiner Stefan^*; Kroker Stefanie; Kaesebier Thomas; Kley Ernst Bernhard; Tuennermann Andreas

来源：Optics Express, 2012, 20(20): 22555-22562.

DOI：10.1364/OE.20.022555

We report on a novel concept for transmissive optical elements based on resonant waveguide gratings (RWGs), which enables the realization of direction selective filters. Hereby, the broadband reflectivity of an RWG for nearly normal incidence angles is combined with high diffractive efficiency in transmission for a specific angle of incidence. Silicon is used as material with high refractive index and good compatibility with semiconductor fabrication. By adjusting the grating parameters different transmission angles and angular widths of the transmission range are feasible. First experimental results of the introduced filters provide a high transmission up to 63% at an incidence angle of 45 degrees with a full width at half maximum of 20 degrees.

• 出版日期2012-9-24