Rotational varifocal moiré metalens made of single-crystal silicon meta-atoms for visible wavelengths

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Abstract: Metasurface lenses (metalenses) offer an ultrathin and simple optical system with dynamic functions that include focal length tuning. In this study, a rotational varifocal (i.e., moiré) metalens based on octagonal single-crystal silicon pillars was designed and fabricated to realize a high transmittance, whole 2π phase coverage, and polarization insensitivity for visible wavelengths. The moiré metalens consists of a pair of cascaded metasurface-based phase lattices and the focal length can be adjusted from negative to positive by mutual rotation. The fabricated moiré metalens demonstrated a focal length that can be tuned from −36 mm to −2 mm and from 2 to 12 mm by mutual rotation from −90° to 90°, and the experimental measurements agreed well with theoretical values at the design wavelength of 633 nm. Imaging was demonstrated at three distinct wavelengths of 633, 532, and 440 nm.

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Bibliographic citation: Rotational varifocal moiré metalens made of single-crystal silicon meta-atoms for visible wavelengths ; volume:11 ; number:9 ; year:2022 ; pages:1941-1948 ; extent:8
Nanophotonics ; 11, Heft 9 (2022), 1941-1948 (gesamt 8)

Creator: Ogawa, Chikara
Nakamura, Sotaro
Aso, Takumi
Ikezawa, Satoshi
Iwami, Kentaro

DOI: 10.1515/nanoph-2021-0690

URN: urn:nbn:de:101:1-2022120813302259579266

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 15.08.2025, 7:36 AM CEST

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Ogawa, Chikara
Nakamura, Sotaro
Aso, Takumi
Ikezawa, Satoshi
Iwami, Kentaro

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Rotational varifocal moiré metalens made of single-crystal silicon meta-atoms for visible wavelengths

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