Overstepping the upper refractive index limit to form ultra-narrow photonic nanojets

Overstepping the upper refractive index limit to form ultra-narrow photonic nanojets

Abstract In general, photonic nanojets (PNJs) occur only when the refractive index (Ri) difference between the microparticle and background media is less than 2. The minimum full width at half-maximum (FWHM) of the PNJ is ~130 nm (approximately one-third of the illumination wavelength λ = 400 nm) fo...

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Autores principales: Guoqiang Gu, Jun Song, Hongda Liang, Mengjie Zhao, Yue Chen, Junle Qu
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2017
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Acceso en línea:https://doaj.org/article/06f5b29a972b42dfa51ce06e9a2ba4ab
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spelling oai:doaj.org-article:06f5b29a972b42dfa51ce06e9a2ba4ab2021-12-02T15:05:18ZOverstepping the upper refractive index limit to form ultra-narrow photonic nanojets10.1038/s41598-017-05781-42045-2322https://doaj.org/article/06f5b29a972b42dfa51ce06e9a2ba4ab2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05781-4https://doaj.org/toc/2045-2322Abstract In general, photonic nanojets (PNJs) occur only when the refractive index (Ri) difference between the microparticle and background media is less than 2. The minimum full width at half-maximum (FWHM) of the PNJ is ~130 nm (approximately one-third of the illumination wavelength λ = 400 nm) formed within the evanescent field region. This paper proposes and studies a method to overstep the Ri upper bound and generate ultra-narrow PNJs. Finite element method based numerical investigations and ray-optics theoretical analyses have realized ultra-narrow PNJs with FWHM as small as 114.7 nm (0.287 λ) obtained from an edge-cut, length-reduced and parabolic-profiled microparticle with Ri = 2.5 beyond evanescent decay length. Using simple strain or compression operations, sub-diffraction-limited PNJs can be flexibly tuned on the order of several wavelengths. Such ultra-narrow PNJs offer great prospects for optical nonlinearity enhancements of greater enhancing effect, optical nanoscopy of higher spatial resolution, optical microprobes of smaller measurement accuracy, nano/micro-sized sample detections of higher sensing sensitivity, nanoscale objects of more accurate control, advanced manufactures of smaller processing size, optical-disk storage of larger data capacity and all-optical switching of lower energy consumption.Guoqiang GuJun SongHongda LiangMengjie ZhaoYue ChenJunle QuNature 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
Guoqiang Gu
Jun Song
Hongda Liang
Mengjie Zhao
Yue Chen
Junle Qu
Overstepping the upper refractive index limit to form ultra-narrow photonic nanojets
description Abstract In general, photonic nanojets (PNJs) occur only when the refractive index (Ri) difference between the microparticle and background media is less than 2. The minimum full width at half-maximum (FWHM) of the PNJ is ~130 nm (approximately one-third of the illumination wavelength λ = 400 nm) formed within the evanescent field region. This paper proposes and studies a method to overstep the Ri upper bound and generate ultra-narrow PNJs. Finite element method based numerical investigations and ray-optics theoretical analyses have realized ultra-narrow PNJs with FWHM as small as 114.7 nm (0.287 λ) obtained from an edge-cut, length-reduced and parabolic-profiled microparticle with Ri = 2.5 beyond evanescent decay length. Using simple strain or compression operations, sub-diffraction-limited PNJs can be flexibly tuned on the order of several wavelengths. Such ultra-narrow PNJs offer great prospects for optical nonlinearity enhancements of greater enhancing effect, optical nanoscopy of higher spatial resolution, optical microprobes of smaller measurement accuracy, nano/micro-sized sample detections of higher sensing sensitivity, nanoscale objects of more accurate control, advanced manufactures of smaller processing size, optical-disk storage of larger data capacity and all-optical switching of lower energy consumption.
format article
author Guoqiang Gu
Jun Song
Hongda Liang
Mengjie Zhao
Yue Chen
Junle Qu
author_facet Guoqiang Gu
Jun Song
Hongda Liang
Mengjie Zhao
Yue Chen
Junle Qu
author_sort Guoqiang Gu
title Overstepping the upper refractive index limit to form ultra-narrow photonic nanojets
title_short Overstepping the upper refractive index limit to form ultra-narrow photonic nanojets
title_full Overstepping the upper refractive index limit to form ultra-narrow photonic nanojets
title_fullStr Overstepping the upper refractive index limit to form ultra-narrow photonic nanojets
title_full_unstemmed Overstepping the upper refractive index limit to form ultra-narrow photonic nanojets
title_sort overstepping the upper refractive index limit to form ultra-narrow photonic nanojets
publisher Nature Portfolio
publishDate 2017
url https://doaj.org/article/06f5b29a972b42dfa51ce06e9a2ba4ab
work_keys_str_mv AT guoqianggu oversteppingtheupperrefractiveindexlimittoformultranarrowphotonicnanojets
AT junsong oversteppingtheupperrefractiveindexlimittoformultranarrowphotonicnanojets
AT hongdaliang oversteppingtheupperrefractiveindexlimittoformultranarrowphotonicnanojets
AT mengjiezhao oversteppingtheupperrefractiveindexlimittoformultranarrowphotonicnanojets
AT yuechen oversteppingtheupperrefractiveindexlimittoformultranarrowphotonicnanojets
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