High sensitivity guided-mode-resonance optical sensor employing phase detection

Abstract We report an ultra-sensitive refractive index (RI) sensor employing phase detection in a guided mode resonance (GMR) structure. By incorporating the GMR structure in to a Mach-Zehnder Interferometer, we measured the phase of GMR signal by calculating the amount of fringe shift. Since the ph...

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Autores principales:	Pankaj K. Sahoo, Swagato Sarkar, Joby Joseph
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8c1be512a59e4f039989290148aac49a
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spelling	oai:doaj.org-article:8c1be512a59e4f039989290148aac49a2021-12-02T12:30:26ZHigh sensitivity guided-mode-resonance optical sensor employing phase detection10.1038/s41598-017-07843-z2045-2322https://doaj.org/article/8c1be512a59e4f039989290148aac49a2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07843-zhttps://doaj.org/toc/2045-2322Abstract We report an ultra-sensitive refractive index (RI) sensor employing phase detection in a guided mode resonance (GMR) structure. By incorporating the GMR structure in to a Mach-Zehnder Interferometer, we measured the phase of GMR signal by calculating the amount of fringe shift. Since the phase of GMR signal varies rapidly around the resonance wavelength, the interference fringe pattern it forms with the reference signal becomes very sensitive to the surrounding RI change. The sensitivity comes out to be 0.608π phase shift per 10−4 RI change in water medium which is more than 100 times higher than the other reported GMR based phase detection method. In our setup, we can achieve a minimum phase shift of (1.94 × 10−3) π that corresponds to a RI change of 3.43 × 10−7, outperforming any of reported optical sensors and making it useful to detect RI changes in gaseous medium as well. We have developed a theoretical model to numerically estimate the phase shift of the GMR signal that predicts the experimental results very well. Our phase detection method comes out to be much more sensitive than the conventional GMR sensors based on wavelength or angle resolved scanning methods.Pankaj K. SahooSwagato SarkarJoby JosephNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Pankaj K. Sahoo Swagato Sarkar Joby Joseph High sensitivity guided-mode-resonance optical sensor employing phase detection
description	Abstract We report an ultra-sensitive refractive index (RI) sensor employing phase detection in a guided mode resonance (GMR) structure. By incorporating the GMR structure in to a Mach-Zehnder Interferometer, we measured the phase of GMR signal by calculating the amount of fringe shift. Since the phase of GMR signal varies rapidly around the resonance wavelength, the interference fringe pattern it forms with the reference signal becomes very sensitive to the surrounding RI change. The sensitivity comes out to be 0.608π phase shift per 10−4 RI change in water medium which is more than 100 times higher than the other reported GMR based phase detection method. In our setup, we can achieve a minimum phase shift of (1.94 × 10−3) π that corresponds to a RI change of 3.43 × 10−7, outperforming any of reported optical sensors and making it useful to detect RI changes in gaseous medium as well. We have developed a theoretical model to numerically estimate the phase shift of the GMR signal that predicts the experimental results very well. Our phase detection method comes out to be much more sensitive than the conventional GMR sensors based on wavelength or angle resolved scanning methods.
format	article
author	Pankaj K. Sahoo Swagato Sarkar Joby Joseph
author_facet	Pankaj K. Sahoo Swagato Sarkar Joby Joseph
author_sort	Pankaj K. Sahoo
title	High sensitivity guided-mode-resonance optical sensor employing phase detection
title_short	High sensitivity guided-mode-resonance optical sensor employing phase detection
title_full	High sensitivity guided-mode-resonance optical sensor employing phase detection
title_fullStr	High sensitivity guided-mode-resonance optical sensor employing phase detection
title_full_unstemmed	High sensitivity guided-mode-resonance optical sensor employing phase detection
title_sort	high sensitivity guided-mode-resonance optical sensor employing phase detection
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/8c1be512a59e4f039989290148aac49a
work_keys_str_mv	AT pankajksahoo highsensitivityguidedmoderesonanceopticalsensoremployingphasedetection AT swagatosarkar highsensitivityguidedmoderesonanceopticalsensoremployingphasedetection AT jobyjoseph highsensitivityguidedmoderesonanceopticalsensoremployingphasedetection
_version_	1718394347124162560

High sensitivity guided-mode-resonance optical sensor employing phase detection

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