互连
拓扑(电路)
共振(粒子物理)
计算机科学
物理
光电子学
电信
工程类
电气工程
量子力学
作者
Haoran Wang,Yi Zuo,Xuefan Yin,Zihao Chen,Zixuan Zhang,Feifan Wang,Yuefeng Hu,Xiaoyu Zhang,Chao Peng
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2024-03-22
卷期号:10 (12)
标识
DOI:10.1126/sciadv.adn4372
摘要
Grating couplers that interconnect photonic chips to off-chip components are crucial for various optoelectronics applications. Despite numerous efforts in past decades, the existing grating couplers are still far from optimal in energy efficiency and thus hinder photonic integration toward a larger scale. Here, we propose a strategy to achieve ultralow-loss grating couplers by using unidirectional guided resonances (UGRs), suppressing the useless downward radiation with no mirror on the bottom. By engineering the dispersion and apodizing the geometry of grating, we experimentally realize a grating coupler with a record-low loss of −0.34 dB and 1-dB bandwidth exceeding 30 nm at the telecom wavelength of 1550 nm and further demonstrate an optic via with a loss of only −0.94 dB. Given that UGRs ubiquitously exist in a variety of grating geometries, our work sheds light on a systematic method to achieve energy-efficient optical interconnect and paves the way to large-scale photonic integration.
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