Near cut-off wavelength operation of resonant waveguide grating biosensors

Abstract Numerical simulations and analytical calculations are performed to support the design of grating-coupled planar optical waveguides for biological sensing. Near cut-off and far from cut-off modes are investigated, and their characteristics and suitability for sensing are compared. The numeri...

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Autores principales:	Balint Kovacs, Fabio Aldo Kraft, Zsolt Szabo, Yousef Nazirizadeh, Martina Gerken, Robert Horvath
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a9769739640f49c8940f0eca917dfff2
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spelling	oai:doaj.org-article:a9769739640f49c8940f0eca917dfff22021-12-02T16:06:10ZNear cut-off wavelength operation of resonant waveguide grating biosensors10.1038/s41598-021-92327-42045-2322https://doaj.org/article/a9769739640f49c8940f0eca917dfff22021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92327-4https://doaj.org/toc/2045-2322Abstract Numerical simulations and analytical calculations are performed to support the design of grating-coupled planar optical waveguides for biological sensing. Near cut-off and far from cut-off modes are investigated, and their characteristics and suitability for sensing are compared. The numerical simulations reveal the high sensitivity of the guided mode intensity near the cut-off wavelength for any refractive index change along the waveguide. Consequently, it is sufficient to monitor the intensity change of the near cut-off sensing mode, which leads to a simpler sensor design compared to those setups where the resonant wavelength shift of the guided mode is monitored with high precision. The operating wavelength and the sensitivity of the proposed device can be tuned by varying the geometrical parameters of the corrugated waveguide. These results may lead to the development of highly sensitive integrated sensors, which have a simple design and therefore are cost-effective for a wide range of applications. These numerical findings are supported with experimental results, where the cut-off sensing mode was identified.Balint KovacsFabio Aldo KraftZsolt SzaboYousef NazirizadehMartina GerkenRobert HorvathNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Balint Kovacs Fabio Aldo Kraft Zsolt Szabo Yousef Nazirizadeh Martina Gerken Robert Horvath Near cut-off wavelength operation of resonant waveguide grating biosensors
description	Abstract Numerical simulations and analytical calculations are performed to support the design of grating-coupled planar optical waveguides for biological sensing. Near cut-off and far from cut-off modes are investigated, and their characteristics and suitability for sensing are compared. The numerical simulations reveal the high sensitivity of the guided mode intensity near the cut-off wavelength for any refractive index change along the waveguide. Consequently, it is sufficient to monitor the intensity change of the near cut-off sensing mode, which leads to a simpler sensor design compared to those setups where the resonant wavelength shift of the guided mode is monitored with high precision. The operating wavelength and the sensitivity of the proposed device can be tuned by varying the geometrical parameters of the corrugated waveguide. These results may lead to the development of highly sensitive integrated sensors, which have a simple design and therefore are cost-effective for a wide range of applications. These numerical findings are supported with experimental results, where the cut-off sensing mode was identified.
format	article
author	Balint Kovacs Fabio Aldo Kraft Zsolt Szabo Yousef Nazirizadeh Martina Gerken Robert Horvath
author_facet	Balint Kovacs Fabio Aldo Kraft Zsolt Szabo Yousef Nazirizadeh Martina Gerken Robert Horvath
author_sort	Balint Kovacs
title	Near cut-off wavelength operation of resonant waveguide grating biosensors
title_short	Near cut-off wavelength operation of resonant waveguide grating biosensors
title_full	Near cut-off wavelength operation of resonant waveguide grating biosensors
title_fullStr	Near cut-off wavelength operation of resonant waveguide grating biosensors
title_full_unstemmed	Near cut-off wavelength operation of resonant waveguide grating biosensors
title_sort	near cut-off wavelength operation of resonant waveguide grating biosensors
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a9769739640f49c8940f0eca917dfff2
work_keys_str_mv	AT balintkovacs nearcutoffwavelengthoperationofresonantwaveguidegratingbiosensors AT fabioaldokraft nearcutoffwavelengthoperationofresonantwaveguidegratingbiosensors AT zsoltszabo nearcutoffwavelengthoperationofresonantwaveguidegratingbiosensors AT yousefnazirizadeh nearcutoffwavelengthoperationofresonantwaveguidegratingbiosensors AT martinagerken nearcutoffwavelengthoperationofresonantwaveguidegratingbiosensors AT roberthorvath nearcutoffwavelengthoperationofresonantwaveguidegratingbiosensors
_version_	1718385109434892288

Near cut-off wavelength operation of resonant waveguide grating biosensors

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