Collimation of diverged beam using a cylindrical lens in a silicon‐based end‐fire optical phased array. Issue 7 (1st March 2020)

• Record Type: Journal Article
• Authors: Yoon, H.; Kim, Y.; Shim, J.‐S.; Park, H.‐H.
• Is Part Of: Electronics letters. Volume 56:Issue 7(2020)
• Page Start: 337
• Page End: 339
• Publication Date: 2020-03-01
• Subjects: beam steering -- silicon -- microlenses -- aspherical optics -- laser beams -- elemental semiconductors; vertically diverged beam -- aspheric cylindrical lens -- microcylindrical lens -- end‐fire OPA -- half‐wavelength radiator array pitch -- collimation effect -- vertical divergence angle -- horizontal beam steering -- horizontal divergence angle -- lens surface -- silicon‐based end‐fire optical phased array -- numerical aperture -- focal length -- angle‐dependant curvature -- wavelength 775.0 nm -- wavelength 1550.0 nm -- Si; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2019.3824
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : The authors demonstrate the collimation of a vertically diverged beam emitted from a silicon‐based end‐fire optical phased array (OPA) using an aspheric cylindrical lens. A micro‐cylindrical lens with a numerical aperture of 0.8 was placed near the focal length in front of an 1 × 16 end‐fire OPA with a half‐wavelength (775 nm) radiator array pitch for a 1550 nm wavelength. The lens provided a great collimation effect, reducing the vertical divergence angle from 95.6° to 6.7° during horizontal beam steering over ±30°. The horizontal divergence angle showed some expansion, from 7.6° to 10°, due to the angle‐dependant curvature of the lens and the distance to the lens surface.