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Virtual‐Moving Metalens Array Enabling Light‐Field Imaging with Enhanced Resolution
Author(s) -
Park MinKyu,
Park ChulSoon,
Hwang Yong Seok,
Kim EunSoo,
Choi DukYong,
Lee SangShin
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202000820
Subject(s) - microlens , optics , materials science , image resolution , polarization (electrochemistry) , light field , angular resolution (graph drawing) , dielectric , parallax , optoelectronics , physics , computer science , lens (geology) , computer vision , chemistry , mathematics , combinatorics
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.