A subwavelength spot and a three-dimensional optical trap formed by a single planar element with azimuthal light

Abstract The generation of subwavelength spots smaller than the Abbe diffraction limit has attracted great interest due to the various applications in many fields, such as high-density optical data storage and particle manipulation. Planar optics that can miniaturize conventional refractive optics h...

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Autores principales:	Jian Guan, Jie Lin, Yuan Ma, Jiubin Tan, Peng Jin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ef2dac7e231a4ef0b6d714f41d819467
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spelling	oai:doaj.org-article:ef2dac7e231a4ef0b6d714f41d8194672021-12-02T11:40:22ZA subwavelength spot and a three-dimensional optical trap formed by a single planar element with azimuthal light10.1038/s41598-017-07810-82045-2322https://doaj.org/article/ef2dac7e231a4ef0b6d714f41d8194672017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07810-8https://doaj.org/toc/2045-2322Abstract The generation of subwavelength spots smaller than the Abbe diffraction limit has attracted great interest due to the various applications in many fields, such as high-density optical data storage and particle manipulation. Planar optics that can miniaturize conventional refractive optics have become increasingly attractive. In this work, we first formed a subwavelength bright spot and a three-dimensional optical trap under the illumination of an azimuthally polarized (AP) beam by only a single planar element, a spiral zone plate (SZP). Initially, the SZP was proposed as a computer-generated hologram to generate optical phase singularities. However, the SZP in this work was used to focus and modulate the incident AP beam with a vortex phase simultaneously. Therefore, no additional vortex phase modulating element was introduced in our method. The SZP has an ultra-long focal length of 250λ for a numerical aperture (NA) of 0.95 and an incident wavelength of 632.8 nm. The generated spot is purely transversely polarized with a lateral full width at half maximum (FWHM) of 0.43λ beyond the diffraction limit of 0.54λ. The generated focal field formed a stable optical trap for a Rayleigh dielectric particle in three dimensions.Jian GuanJie LinYuan MaJiubin TanPeng JinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jian Guan Jie Lin Yuan Ma Jiubin Tan Peng Jin A subwavelength spot and a three-dimensional optical trap formed by a single planar element with azimuthal light
description	Abstract The generation of subwavelength spots smaller than the Abbe diffraction limit has attracted great interest due to the various applications in many fields, such as high-density optical data storage and particle manipulation. Planar optics that can miniaturize conventional refractive optics have become increasingly attractive. In this work, we first formed a subwavelength bright spot and a three-dimensional optical trap under the illumination of an azimuthally polarized (AP) beam by only a single planar element, a spiral zone plate (SZP). Initially, the SZP was proposed as a computer-generated hologram to generate optical phase singularities. However, the SZP in this work was used to focus and modulate the incident AP beam with a vortex phase simultaneously. Therefore, no additional vortex phase modulating element was introduced in our method. The SZP has an ultra-long focal length of 250λ for a numerical aperture (NA) of 0.95 and an incident wavelength of 632.8 nm. The generated spot is purely transversely polarized with a lateral full width at half maximum (FWHM) of 0.43λ beyond the diffraction limit of 0.54λ. The generated focal field formed a stable optical trap for a Rayleigh dielectric particle in three dimensions.
format	article
author	Jian Guan Jie Lin Yuan Ma Jiubin Tan Peng Jin
author_facet	Jian Guan Jie Lin Yuan Ma Jiubin Tan Peng Jin
author_sort	Jian Guan
title	A subwavelength spot and a three-dimensional optical trap formed by a single planar element with azimuthal light
title_short	A subwavelength spot and a three-dimensional optical trap formed by a single planar element with azimuthal light
title_full	A subwavelength spot and a three-dimensional optical trap formed by a single planar element with azimuthal light
title_fullStr	A subwavelength spot and a three-dimensional optical trap formed by a single planar element with azimuthal light
title_full_unstemmed	A subwavelength spot and a three-dimensional optical trap formed by a single planar element with azimuthal light
title_sort	subwavelength spot and a three-dimensional optical trap formed by a single planar element with azimuthal light
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/ef2dac7e231a4ef0b6d714f41d819467
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A subwavelength spot and a three-dimensional optical trap formed by a single planar element with azimuthal light

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