Highly directional Si antenna based on dual-layer gratings for optical phased array

Lei Yu; Wenyuan Liao; Pengfei Wang; Pengfei Ma; Guangzhen Luo; Langlin Cui; Chen Lv; Yejin Zhang; Jiaoqing Pan

doi:10.1117/12.2643044

4 January 2023 Highly directional Si antenna based on dual-layer gratings for optical phased array

Lei Yu, Wenyuan Liao, Pengfei Wang, Pengfei Ma, Guangzhen Luo, Langlin Cui, Chen Lv, Yejin Zhang, Jiaoqing Pan

Proceedings Volume 12322, Nanophotonics, Micro/Nano Optics, and Plasmonics VIII; 123220O (2023) https://doi.org/10.1117/12.2643044
Event: SPIE/COS Photonics Asia, 2022, Online Only

Conference Poster

Abstract

Optical phased array has great potential in the fields of light detection and ranging, free-space optical communication, laser imaging and biosensors due to their excellent characteristics such as all-solid-state structure, fast scanning speed, good stability, high resolution and low cost. According to the radar equation, the transmit power will directly determine the maximum ranging distance of optical phased arrays. Limited by nonlinear effects and damage threshold, it is difficult to further increase the input optical power of Si-based OPA above 30 dB. Therefore, fully utilizing the input optical power of OPA is an important issue in the research. In this paper, we demonstrate a novel three-layer silicon antenna for OPA, which consists of a upside grating layer, a waveguide layer and a downside grating layer from top to bottom. In the simulation, we found that the upward directivity of the antenna is greater than 60% in a large wavelength range of 1413 nm to 1875 nm. In addition, the maximum upward directivity of the antenna is 94.68% at 1599nm. The above result is beneficial to increase the output power of the phased array and eliminate the blind area in the field of view when the beam is scanned to the point of destructive interference. Overall, the above results show that the design proposed in this paper has great potential for application.

Citation Download Citation

Lei Yu, Wenyuan Liao, Pengfei Wang, Pengfei Ma, Guangzhen Luo, Langlin Cui, Chen Lv, Yejin Zhang, and Jiaoqing Pan "Highly directional Si antenna based on dual-layer gratings for optical phased array", Proc. SPIE 12322, Nanophotonics, Micro/Nano Optics, and Plasmonics VIII, 123220O (4 January 2023); https://doi.org/10.1117/12.2643044

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