Metasurface Freeform Nanophotonics

Abstract Freeform optics aims to expand the toolkit of optical elements by allowing for more complex phase geometries beyond rotational symmetry. Complex, asymmetric curvatures are employed to enhance the performance of optical components while minimizing their size. Unfortunately, these high curvat...

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Autores principales:	Alan Zhan, Shane Colburn, Christopher M. Dodson, Arka Majumdar
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c95dabf267de4206bb3c43b6486623ad
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spelling	oai:doaj.org-article:c95dabf267de4206bb3c43b6486623ad2021-12-02T11:40:21ZMetasurface Freeform Nanophotonics10.1038/s41598-017-01908-92045-2322https://doaj.org/article/c95dabf267de4206bb3c43b6486623ad2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01908-9https://doaj.org/toc/2045-2322Abstract Freeform optics aims to expand the toolkit of optical elements by allowing for more complex phase geometries beyond rotational symmetry. Complex, asymmetric curvatures are employed to enhance the performance of optical components while minimizing their size. Unfortunately, these high curvatures and complex forms are often difficult to manufacture with current technologies, especially at the micron scale. Metasurfaces are planar sub-wavelength structures that can control the phase, amplitude, and polarization of incident light, and can thereby mimic complex geometric curvatures on a flat, wavelength-scale thick surface. We present a methodology for designing analogues of freeform optics using a silicon nitride based metasurface platform for operation at visible wavelengths. We demonstrate a cubic phase plate with a point spread function exhibiting enhanced depth of field over 300 micron along the optical axis with potential for performing metasurface-based white light imaging, and an Alvarez lens with a tunable focal length range of over 2.5 mm corresponding to a change in optical power of ~1600 diopters with 100 micron of total mechanical displacement. The adaptation of freeform optics to a sub-wavelength metasurface platform allows for further miniaturization of optical components and offers a scalable route toward implementing near-arbitrary geometric curvatures in nanophotonics.Alan ZhanShane ColburnChristopher M. DodsonArka MajumdarNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alan Zhan Shane Colburn Christopher M. Dodson Arka Majumdar Metasurface Freeform Nanophotonics
description	Abstract Freeform optics aims to expand the toolkit of optical elements by allowing for more complex phase geometries beyond rotational symmetry. Complex, asymmetric curvatures are employed to enhance the performance of optical components while minimizing their size. Unfortunately, these high curvatures and complex forms are often difficult to manufacture with current technologies, especially at the micron scale. Metasurfaces are planar sub-wavelength structures that can control the phase, amplitude, and polarization of incident light, and can thereby mimic complex geometric curvatures on a flat, wavelength-scale thick surface. We present a methodology for designing analogues of freeform optics using a silicon nitride based metasurface platform for operation at visible wavelengths. We demonstrate a cubic phase plate with a point spread function exhibiting enhanced depth of field over 300 micron along the optical axis with potential for performing metasurface-based white light imaging, and an Alvarez lens with a tunable focal length range of over 2.5 mm corresponding to a change in optical power of ~1600 diopters with 100 micron of total mechanical displacement. The adaptation of freeform optics to a sub-wavelength metasurface platform allows for further miniaturization of optical components and offers a scalable route toward implementing near-arbitrary geometric curvatures in nanophotonics.
format	article
author	Alan Zhan Shane Colburn Christopher M. Dodson Arka Majumdar
author_facet	Alan Zhan Shane Colburn Christopher M. Dodson Arka Majumdar
author_sort	Alan Zhan
title	Metasurface Freeform Nanophotonics
title_short	Metasurface Freeform Nanophotonics
title_full	Metasurface Freeform Nanophotonics
title_fullStr	Metasurface Freeform Nanophotonics
title_full_unstemmed	Metasurface Freeform Nanophotonics
title_sort	metasurface freeform nanophotonics
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c95dabf267de4206bb3c43b6486623ad
work_keys_str_mv	AT alanzhan metasurfacefreeformnanophotonics AT shanecolburn metasurfacefreeformnanophotonics AT christophermdodson metasurfacefreeformnanophotonics AT arkamajumdar metasurfacefreeformnanophotonics
_version_	1718395671283761152

Metasurface Freeform Nanophotonics

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