Multifocal multilevel diffractive lens by wavelength multiplexing

Flat lenses with focal length tunability can enable the development of highly integrated imaging systems. This work explores machine learning to inverse design a multifocal multilevel diffractive lens (MMDL) by wavelength multiplexing. The MMDL output is multiplexed in three color channels, red (650...

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Veröffentlicht in:Applied optics (2004) 2023-09, Vol.62 (26), p.6931-6938
Hauptverfasser: Jia, Wei, Lin, Dajun, Menon, Rajesh, Sensale-Rodriguez, Berardi
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container_end_page 6938
container_issue 26
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container_title Applied optics (2004)
container_volume 62
creator Jia, Wei
Lin, Dajun
Menon, Rajesh
Sensale-Rodriguez, Berardi
description Flat lenses with focal length tunability can enable the development of highly integrated imaging systems. This work explores machine learning to inverse design a multifocal multilevel diffractive lens (MMDL) by wavelength multiplexing. The MMDL output is multiplexed in three color channels, red (650 nm), green (550 nm), and blue (450 nm), to achieve varied focal lengths of 4 mm, 20 mm, and 40 mm at these three color channels, respectively. The focal lengths of the MMDL scale significantly with the wavelength in contrast to conventional diffractive lenses. The MMDL consists of concentric rings with equal widths and varied heights. The machine learning method is utilized to optimize the height of each concentric ring to obtain the desired phase distribution so as to achieve varied focal lengths multiplexed by wavelengths. The designed MMDL is fabricated through a direct-write laser lithography system with gray-scale exposure. The demonstrated singlet lens is miniature and polarization insensitive, and thus can potentially be applied in integrated optical imaging systems to achieve zooming functions.
doi_str_mv 10.1364/AO.497775
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source Alma/SFX Local Collection; Optica Publishing Group Journals
subjects Channels
Color
Inverse design
Lenses
Machine learning
Multiplexing
Phase distribution
Zooming
title Multifocal multilevel diffractive lens by wavelength multiplexing
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