Title :
An embedded waveguide lens with anti-reflection layer
Author :
Su, T.J. ; Lee, C.C.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA
Abstract :
A low-index waveguide of lens shape is embedded in a high-index Ga/sub .72/Al/sub .28/As/Ga/sub .59/Al/sub .41/As host waveguide with anti-reflection layer incorporated at the lens boundaries to reduce reflections. An improvement factor of 1.25 in the throughput efficiency of the lens is achieved by the inclusion of AR layer. At an f-number of 1.8 and a wavelength of 1.152 μm, a focal spot size of 2.1 μm and a sidelobe level of /spl minus/13 dB were measured. The angular field of view measured in the host waveguide is 11/spl deg/.
Keywords :
antireflection coatings; integrated optics; lenses; optical films; optical waveguides; refractive index; 1.152 mum; AR layer; Ga/sub .72/Al/sub .28/As/Ga/sub .59/Al/sub .41/As; GaAlAs-GaAlAs; angular field of view; anti-reflection layer; embedded waveguide lens; f-number; focal spot size; high-index; host waveguide; improvement factor; lens boundaries; lens shape; low-index waveguide; reduced reflections; sidelobe level; throughput efficiency; Etching; Gallium arsenide; Lenses; Optical refraction; Optical variables control; Optical waveguides; Resists; Shape; Throughput; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
