AN EMBEDDED WAVE-GUIDE LENS WITH ANTIREFLECTION LAYER

A low-index waveguide of lens shape is embedded in a high-index Ga.72A l.28As/Ga.59Al.41As host waveguide with anti-reflection layer incorpor ated at the lens boundaries to reduce reflections. An improvement fact or 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 1.15 2 mum, a focal spot size of 2.1 mum and a sidelobe level of -13 dB wer e measured. The angular field of view measured in the host waveguide i s 11-degrees.