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oai:riuma.uma.es:10630/248182026-02-03T10:49:58Zcom_10630_2254col_10630_37953

Benedikovič, Daniel Liu, Qiankun Sánchez-Postigo, Alejandro Atieh, Ahmad Smy, Tom Cheben, Pavel Ye, Winnie N. 2022-08-25T10:30:45Z 2022-08-25T10:30:45Z 2022-08-16 Benedikovič D, Liu Q, Sánchez-Postigo A, Atieh A, Smy T, Cheben P, Ye WN. Circular Optical Phased Array with Large Steering Range and High Resolution. Sensors. 2022; 22(16):6135. https://doi.org/10.3390/s22166135 https://hdl.handle.net/10630/24818 https://doi.org/10.3390/s22166135 Light detection and ranging systems based on optical phased arrays and integrated silicon photonics have sparked a surge of applications over the recent years. This includes applications in sensing, free-space communications, or autonomous vehicles, to name a few. Herein, we report a design of two-dimensional optical phased arrays, which are arranged in a grid of concentric rings. We numerically investigate two designs composed of 110 and 820 elements, respectively. Both single-wavelength (1550 nm) and broadband multi-wavelength (1535 nm to 1565 nm) operations are studied. The proposed phased arrays enable free-space beam steering, offering improved performance with narrow beam divergences of only 0.5° and 0.22° for the 110-element and 820-element arrays, respectively, with a main-to-sidelobe suppression ratio higher than 10 dB. The circular array topology also allows large element spacing far beyond the sub-wavelength-scaled limits that are present in one-dimensional linear or two-dimensional rectangular arrays. Under a single-wavelength operation, a solid-angle steering between 0.21π sr and 0.51π sr is obtained for 110- and 820-element arrays, respectively, while the beam steering spans the range of 0.24π sr and 0.57π sr for a multi-wavelength operation. This work opens new opportunities for future optical phased arrays in on-chip photonic applications, in which fast, high-resolution, and broadband beam steering is necessary. eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Fotónica Circular Optical Phased Array with Large Steering Range and High Resolution journal article