Structured Back Focal Plane Interferometry (SBFPI)

Abstract Back focal plane interferometry (BFPI) is one of the most straightforward and powerful methods for achieving sub-nanometer particle tracking precision at high speed (MHz). BFPI faces technical challenges that prohibit tunable expansion of linear detection range with minimal loss to sensitiv...

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Autores principales:	Avinash Upadhya, Yujie Zheng, Li Li, Woei Ming Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/64ab2c76beae40e48d21d6baa745d719
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spelling	oai:doaj.org-article:64ab2c76beae40e48d21d6baa745d7192021-12-02T15:12:22ZStructured Back Focal Plane Interferometry (SBFPI)10.1038/s41598-019-56199-z2045-2322https://doaj.org/article/64ab2c76beae40e48d21d6baa745d7192019-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-56199-zhttps://doaj.org/toc/2045-2322Abstract Back focal plane interferometry (BFPI) is one of the most straightforward and powerful methods for achieving sub-nanometer particle tracking precision at high speed (MHz). BFPI faces technical challenges that prohibit tunable expansion of linear detection range with minimal loss to sensitivity, while maintaining robustness against optical aberrations. In this paper, we devise a tunable BFPI combining a structured beam (conical wavefront) and structured detection (annular quadrant photodiode). This technique, which we termed Structured Back Focal Plane Interferometry (SBFPI), possesses three key novelties namely: extended tracking range, low loss in sensitivity, and resilience to spatial aberrations. Most importantly, the conical wavefront beam preserves the axial Gouy phase shift and lateral beam waist that can then be harnessed in a conventional BFPI system. Through a series of experimental results, we were able to tune detection sensitivity and detection range over the SBFPI parameter space. We also identified a figure of merit based on the experimental optimum that allows us to identify optimal SBPFI configurations that balance both range and sensitivity. In addition, we also studied the resilience of SBFPI against asymmetric spatial aberrations (astigmatism of up to 0.8 λ) along the lateral directions. The simplicity and elegance of SBFPI will accelerate its dissemination to many associated fields in optical detection, interferometry and force spectroscopy.Avinash UpadhyaYujie ZhengLi LiWoei Ming LeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-10 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Avinash Upadhya Yujie Zheng Li Li Woei Ming Lee Structured Back Focal Plane Interferometry (SBFPI)
description	Abstract Back focal plane interferometry (BFPI) is one of the most straightforward and powerful methods for achieving sub-nanometer particle tracking precision at high speed (MHz). BFPI faces technical challenges that prohibit tunable expansion of linear detection range with minimal loss to sensitivity, while maintaining robustness against optical aberrations. In this paper, we devise a tunable BFPI combining a structured beam (conical wavefront) and structured detection (annular quadrant photodiode). This technique, which we termed Structured Back Focal Plane Interferometry (SBFPI), possesses three key novelties namely: extended tracking range, low loss in sensitivity, and resilience to spatial aberrations. Most importantly, the conical wavefront beam preserves the axial Gouy phase shift and lateral beam waist that can then be harnessed in a conventional BFPI system. Through a series of experimental results, we were able to tune detection sensitivity and detection range over the SBFPI parameter space. We also identified a figure of merit based on the experimental optimum that allows us to identify optimal SBPFI configurations that balance both range and sensitivity. In addition, we also studied the resilience of SBFPI against asymmetric spatial aberrations (astigmatism of up to 0.8 λ) along the lateral directions. The simplicity and elegance of SBFPI will accelerate its dissemination to many associated fields in optical detection, interferometry and force spectroscopy.
format	article
author	Avinash Upadhya Yujie Zheng Li Li Woei Ming Lee
author_facet	Avinash Upadhya Yujie Zheng Li Li Woei Ming Lee
author_sort	Avinash Upadhya
title	Structured Back Focal Plane Interferometry (SBFPI)
title_short	Structured Back Focal Plane Interferometry (SBFPI)
title_full	Structured Back Focal Plane Interferometry (SBFPI)
title_fullStr	Structured Back Focal Plane Interferometry (SBFPI)
title_full_unstemmed	Structured Back Focal Plane Interferometry (SBFPI)
title_sort	structured back focal plane interferometry (sbfpi)
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/64ab2c76beae40e48d21d6baa745d719
work_keys_str_mv	AT avinashupadhya structuredbackfocalplaneinterferometrysbfpi AT yujiezheng structuredbackfocalplaneinterferometrysbfpi AT lili structuredbackfocalplaneinterferometrysbfpi AT woeiminglee structuredbackfocalplaneinterferometrysbfpi
_version_	1718387633093083136

Structured Back Focal Plane Interferometry (SBFPI)

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