Collimation of diverged beam using a cylindrical lens in a silicon-based end-fire optical phased array

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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 x 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 degrees to 6.7 degrees during horizontal beam steering over +/- 30 degrees. The horizontal divergence angle showed some expansion, from 7.6 degrees to 10 degrees, due to the angle-dependant curvature of the lens and the distance to the lens surface.
Publisher
INST ENGINEERING TECHNOLOGY-IET
Issue Date
2020-03
Language
English
Article Type
Article
Citation

ELECTRONICS LETTERS, v.56, no.7, pp.337 - 339

ISSN
0013-5194
DOI
10.1049/el.2019.3824
URI
http://hdl.handle.net/10203/274457
Appears in Collection
EE-Journal Papers(저널논문)
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