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

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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.

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Yoon, H., Kim, Y., Shim, J. S., & Park, H. H. (2020). Collimation of diverged beam using a cylindrical lens in a silicon-based end-fire optical phased array. Electronics Letters, 56(7), 337–339. https://doi.org/10.1049/el.2019.3824

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