Fast topographic optical imaging using encoded search focal scan

A central quest in optics is to rapidly extract quantitative information from a sample. Existing topographical imaging tools allow non-contact and three-dimensional measurements at the micro and nanoscales and are essential in applications including precision engineering and optical quality control....

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Detalhes bibliográficos
Autores: Vilar, Narcís, Artigas, Roger, Duocastella, Martí, Carles, Guillem
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2024
País:España
Recursos:Universidad de Barcelona
Repositório:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/222182
Acesso em linha:https://hdl.handle.net/2445/222182
Access Level:Acceso aberto
Palavra-chave:Topografia
Imatges òptiques
Escàners (Lector òptic)
Topography
Optical images
Optical scanners
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spelling Fast topographic optical imaging using encoded search focal scanVilar, NarcísArtigas, RogerDuocastella, MartíCarles, GuillemTopografiaImatges òptiquesEscàners (Lector òptic)TopographyOptical imagesOptical scannersA central quest in optics is to rapidly extract quantitative information from a sample. Existing topographical imaging tools allow non-contact and three-dimensional measurements at the micro and nanoscales and are essential in applications including precision engineering and optical quality control. However, these techniques involve acquiring a focal stack of images, a time-consuming process that prevents measurement of moving samples. Here, we propose a method for increasing the speed of topographic imaging by orders of magnitude. Our approach involves collecting a reduced set of images, each integrated during the full focal scan, whilst the illumination is synchronously modulated during exposure. By properly designing the modulation sequence for each image, unambiguous reconstruction of the object height map is achieved using far fewer images than conventional methods. We describe the theoretical foundations of our technique, characterise its performance, and demonstrate sub-micrometric topographic imaging over 100 µm range of static and dynamic systems at rates as high as 67 topographies per second, limited by the camera frame rate. The high speed of the technique and its ease of implementation could enable a paradigm shift in optical metrology, allowing the real-time characterisation of large or rapidly moving samples.Nature Publishing Group2024info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/222182Articles publicats en revistes (Física Aplicada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1038/s41467-024-46267-yNature Communications, 2024, vol. 15, num.1https://doi.org/10.1038/s41467-024-46267-ycc-by (c) Vilar, N. et al., 2024http://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2221822026-05-27T06:46:51Z
dc.title.none.fl_str_mv Fast topographic optical imaging using encoded search focal scan
title Fast topographic optical imaging using encoded search focal scan
spellingShingle Fast topographic optical imaging using encoded search focal scan
Vilar, Narcís
Topografia
Imatges òptiques
Escàners (Lector òptic)
Topography
Optical images
Optical scanners
title_short Fast topographic optical imaging using encoded search focal scan
title_full Fast topographic optical imaging using encoded search focal scan
title_fullStr Fast topographic optical imaging using encoded search focal scan
title_full_unstemmed Fast topographic optical imaging using encoded search focal scan
title_sort Fast topographic optical imaging using encoded search focal scan
dc.creator.none.fl_str_mv Vilar, Narcís
Artigas, Roger
Duocastella, Martí
Carles, Guillem
author Vilar, Narcís
author_facet Vilar, Narcís
Artigas, Roger
Duocastella, Martí
Carles, Guillem
author_role author
author2 Artigas, Roger
Duocastella, Martí
Carles, Guillem
author2_role author
author
author
dc.subject.none.fl_str_mv Topografia
Imatges òptiques
Escàners (Lector òptic)
Topography
Optical images
Optical scanners
topic Topografia
Imatges òptiques
Escàners (Lector òptic)
Topography
Optical images
Optical scanners
description A central quest in optics is to rapidly extract quantitative information from a sample. Existing topographical imaging tools allow non-contact and three-dimensional measurements at the micro and nanoscales and are essential in applications including precision engineering and optical quality control. However, these techniques involve acquiring a focal stack of images, a time-consuming process that prevents measurement of moving samples. Here, we propose a method for increasing the speed of topographic imaging by orders of magnitude. Our approach involves collecting a reduced set of images, each integrated during the full focal scan, whilst the illumination is synchronously modulated during exposure. By properly designing the modulation sequence for each image, unambiguous reconstruction of the object height map is achieved using far fewer images than conventional methods. We describe the theoretical foundations of our technique, characterise its performance, and demonstrate sub-micrometric topographic imaging over 100 µm range of static and dynamic systems at rates as high as 67 topographies per second, limited by the camera frame rate. The high speed of the technique and its ease of implementation could enable a paradigm shift in optical metrology, allowing the real-time characterisation of large or rapidly moving samples.
publishDate 2024
dc.date.none.fl_str_mv 2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/222182
url https://hdl.handle.net/2445/222182
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1038/s41467-024-46267-y
Nature Communications, 2024, vol. 15, num.1
https://doi.org/10.1038/s41467-024-46267-y
dc.rights.none.fl_str_mv cc-by (c) Vilar, N. et al., 2024
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) Vilar, N. et al., 2024
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Nature Publishing Group
publisher.none.fl_str_mv Nature Publishing Group
dc.source.none.fl_str_mv Articles publicats en revistes (Física Aplicada)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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