Open AccessOn-chip platform for a phased array with minimal beam divergence and wide field-of-view
Author(s) -
Moshe Zadka,
You-Chia Chang,
Aseema Mohanty,
Christopher T. Phare,
Samantha P. Roberts,
Michal Lipson
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.002528
Subject(s) - optics , grating , beam divergence , materials science , beam steering , beam (structure) , holography , apodization , phased array , duty cycle , silicon photonics , diffraction efficiency , phased array optics , diffraction grating , optoelectronics , photonics , beam diameter , physics , computer science , telecommunications , laser , quantum mechanics , laser beams , antenna (radio) , power (physics)
Current silicon photonics phased arrays based on waveguide gratings enable beam steering with no moving parts. However, they suffer from a trade-off between beam divergence and field of view. Here, we show a platform based on silicon-nitride/silicon that achieves simultaneously minimal beam divergence and maximum field of view while maintaining performance that is robust to fabrication variations. In addition, in order to maximize the emission from the entire length of the grating, we design the grating's strength by varying its duty cycle (apodization) to emit uniformly. We fabricate a millimeter long grating emitter with diffraction-limited beam divergence of 0.089°.