• Photonics Research
  • Vol. 9, Issue 12, 2388 (2021)
Feng Zhao1、2, Zicheng Shen2, Decheng Wang1, Bijie Xu1, Xiangning Chen1、3、*, and Yuanmu Yang2、4、*
Author Affiliations
  • 1School of Space Information, Space Engineering University, Beijing 101416, China
  • 2State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
  • 3e-mail: xn_chen_edu@163.com
  • 4e-mail: ymyang@tsinghua.edu.cn
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    DOI: 10.1364/PRJ.440185 Cite this Article Set citation alerts
    Feng Zhao, Zicheng Shen, Decheng Wang, Bijie Xu, Xiangning Chen, Yuanmu Yang. Synthetic aperture metalens[J]. Photonics Research, 2021, 9(12): 2388 Copy Citation Text show less

    Abstract

    Metalenses are ultrathin optical elements that can focus light using densely arranged subwavelength structures. Due to their minimal form factor, they have been considered promising for imaging applications that require extreme system size, weight, and power, such as in consumer electronics and remote sensing. However, as a major impediment prohibiting the wide adoption of the metalens technology, the aperture size, and consequently the imaging resolution, of a metalens are often limited by lithography processes that are not scalable. Here, we propose to adopt a synthetic aperture approach to alleviate the issue, and experimentally demonstrate that, assisted by computational reconstruction, a synthetic aperture metalens composed of multiple metalenses with relatively small aperture size can achieve an imaging resolution comparable to a conventional lens with an equivalent large aperture. We validate the concept via an outdoor imaging experiment performed with a synthetic aperture metalens-integrated near-infrared camera using natural sunlight for target illumination.
    ϕ(x,y)=2πλ(x2+y2+f2f),

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    g(x,y)=f(x,y)*PSF(x,y)+n(x,y),(A1)

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    P(x,y)=circ(x2+y2D/2),(A2)

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    PSF(x,y)=|F{P(x,y)}|2,(A3)

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    OTF(u,v)=F{PSF(x,y)}PSF(x,y)dxdy,(A4)

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    Parray(x,y)=k=1NPsub(xxk,yyk)eiϕk(x,y),(A5)

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    p(f|g)=p(g|f)p(f)p(g).(C1)

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    p(g|f)=(x,y)h(x,y)*f(x,y)g(x,y)e(h*f)(x,y)g(x,y)!.(C2)

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    f(k+1)(x,y)=[g(x,y)h(x,y)*f(k)(x,y)*h(x,y)T]f(k)(x,y),(C3)

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    Feng Zhao, Zicheng Shen, Decheng Wang, Bijie Xu, Xiangning Chen, Yuanmu Yang. Synthetic aperture metalens[J]. Photonics Research, 2021, 9(12): 2388
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