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Subwavelength on-chip light focusing with bigradient all-dielectric metamaterials for dense photonic integration

InfoMat 2022年第2期4卷 139-151页

作者： Zhihao Ren Bowei Dong Qifeng Qiao Xinmiao Liu Jinyuan Liu Guangya Zhou Chengkuo Lee Department of Electrical and Computer Engineering National University of SingaporeSingaporeSingapore Center for Intelligent Sensors and MEMS(CISM) National University of SingaporeSingaporeSingapore NUS Suzhou Research Institute(NUSRI) SuzhouChina Department of Mechanical Engineering National University of SingaporeSingaporeSingapore NUS Graduate School-Integrative Sciences and Engineering Programme(ISEP) National University of SingaporeSingaporeSingapore

Photonic integrated circuits(PICs)provide a promising platform for miniaturized on-chip optical systems for communication,computation,and sensing *** dense integration of photonic components is one of the keys to exploit the advantages of *** light focusing is a fundamental and indispensable function in PICs,focusing light at the micro/nanometer-scale is ***,a bigradient on-chip metalens(BOML)is proposed to achieve ultrasmall focal lengths and spot sizes at the subwavelength scale for dense *** design of BOML combines gradient geometry and gradient refractive index into one metalens by simultaneously engineering the length and width of subwavelength silicon *** a small device footprint of only 168μm,the BOML achieves efficient on-chip focusing with the recordbreaking figure-of-merits,which are the ratio of wavelength to focal length/spot size(0.268 and 2.83)and numerical aperture(1.78).Leveraging on the Fresnel design,the footprint of BOML is further reduced by 55.1%,and the numerical aperture is enhanced to *** demonstration of mode conversion and beam steering with efficiency over 80%and a tilting range of 7.2°holds the potential for highly dense on-chip photonic systems for optical communication,optical sensing,nonlinear optics,and neural networks for deep learning.

关键词： all-dielectric metamaterials beam steering mid-infrared on-chip focusing photonic integrated circuits

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