A New Guided Wave Lens Structure and Its Application
Abstract
A low-index waveguide of lens shape is embedded in a high-index Ga(. 72)Al(.28)/Ga(.59)Al(.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 um, a focal spot size of 2.1 um and a sidelobe level of -13 dB were measured. The angular field of view measured in the host waveguide is 11 deg. A quadri-level photomasking technique was developed for the fabrication of the new lens structure. This technique can be applied to various integrated optics structures where reflection reduction is required between low-index and high-index waveguide regions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 08, 1993
- Accession Number
- ADA275541
Entities
People
- Chin C. Lee
Organizations
- University of California, Irvine