Open AccessCollimation of diverged beam using a cylindrical lens in a silicon‐based end‐fire optical phased array
Author(s) -
Yoon H.,
Kim Y.,
Shim J.S.,
Park H.H.
Publication year - 2020
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.3824
Subject(s) - collimated light , optics , phased array , phased array optics , lens (geology) , silicon , beam (structure) , physics , materials science , optoelectronics , engineering , electrical engineering , laser , antenna (radio)
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.