Journal
ADVANCED OPTICAL MATERIALS
Volume 8, Issue 21, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202000820
Keywords
light-field imaging; metasurface lens array; multifunctional metasurface; polarization-dependent movable lens array; resolution improvement
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2018R1A6A1A03025242]
- National Research Foundation of Korea [4299990114056] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The light-field (LF) imaging technique can obtain the light intensity and directional ray distribution information by utilizing a microlens array (MLA). Based on the recoded 3D information, full-parallax or depth-slice images can be reconstructed. Due to the limited ray sampling rate of the MLA, however, conventional LF imaging schemes are fatally susceptible to a trade-off between the spatial and angular resolution. To mitigate this issue, a virtual-moving metalens array (VMMA) based on a multifunctional dielectric metasurface is proposed, which can laterally shift the sampling position without physical movement, by simply tailoring the polarization of incident beam. Thanks to the polarization-tailored VMMA, the LF imaging scheme is successfully realized to provide a fourfold enhanced spatial resolution without sacrificing the angular resolution.
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