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Enhancing Photon Throughput of Miniaturized Passive Depth-Detection Cameras via Broadband Dispersion-Engineered Metalenses
journal contribution
posted on 2023-10-06, 15:03 authored by Zhanyi Zhang, Lingyun Xie, Jian Zhang, Tao He, Jingyuan Zhu, Zhanshan Wang, Xiong Dun, Xinbin ChengWith
the continuous advancement of technology, there is a growing
demand for depth-detection cameras with a small footprint and high
photon throughput. Metalenses offer an excellent platform for implementing
single-lens depth-detection cameras. However, the narrow operational
bandwidth of the metalenses used in these miniaturized cameras significantly
limits the photon throughput. Here, we propose a broadband dispersionless
double-helix metalens (DL-DH metalens) to enhance the photon throughput
and mitigate motion blur in miniaturized passive depth-detection cameras.
Through engineering the dispersion, the DL-DH metalens was designed
to achieve an irrotational double-helix point spread function (DH-PSF)
over the broadband wavelength, thus eliminating the depth-detection
error caused by chromatic aberration. The operational bandwidth of
the fabricated metalens was expanded to 200 nm for obtaining higher-photon
throughput, resulting in a 10-fold reduction in the exposure time
compared with that observed for a narrow operational bandwidth of
30 nm. The sharp images could be captured by the DL-DH metalens to
acquire accurate depth information, even in the presence of moving
objects. Our proposed metalens provides a solution for enhancing the
photon throughput in miniaturized passive depth-detection cameras
operated in low-light environments.
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Keywords
sharp images couldmitigate motion blurexposure time compareddetection error causedhigh photon throughputproposed metalens providesdetection cameras operatednarrow operational bandwidthminiaturized passive depthbroadband dispersionless doubleenhancing photon throughputphoton throughputdetection camerasoperational bandwidthirrotational doublebroadband wavelengthhelix metalensfabricated metalensthus eliminatingsmall footprintobtaining highermoving objectsmetalenses usedmetalenses offerlight environmentslens depthimplementing singlegrowing demandfold reductionexcellent platformengineered metalensescontinuous advancementchromatic aberration30 nm200 nm