光束转向
材料科学
栅栏
光学
光电子学
光子学
波长
电介质
天线(收音机)
硅
梁(结构)
计算机科学
物理
电信
作者
Woo‐Bin Lee,Chul-Soon Im,Changyi Zhou,Bishal Bhandari,Duk‐Yong Choi,Sang‐Shin Lee
出处
期刊:Photonics Research
[The Optical Society]
日期:2021-12-22
卷期号:10 (1): 248-248
被引量:14
摘要
We propose and demonstrate an optical phased-array-based bidirectional grating antenna (BDGA) in silicon nitride waveguides. The BDGA is integrated with a miniaturized all-dielectric metasurface doublet (MD) formed on a glass substrate. The BDGA device, which takes advantage of alternately feeding light to its ports in opposite directions, is presumed to effectively provide a doubled wavelength-tuned steering efficiency compared to its unidirectional counterpart. The MD, which is based on vertically cascaded convex and concave metalenses comprising circular hydrogenated amorphous silicon nanopillars, is meticulously placed atop the BDGA chip to accept and deflect a beam emanating from the emission area, thereby boosting the beam-steering performance. The manufactured BDGA could achieve an enhanced beam-steering efficiency of 0.148 deg/nm as well as a stable spectral emission response in the wavelength range of 1530–1600 nm. By deploying a fabricated MD atop the silicon photonic BDGA chip, the steering efficiency was confirmed to be boosted by a factor of ∼ 3.1 , reaching 0.461 deg/nm, as intended.
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