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Design for Distributed Feedback Laser Biosensors Based on the Active Grating Model

The distributed feedback (DFB) laser is widely used in sensing because of its portable size, simple fabrication and high sensitivity. Most theoretical design models are based on passive Bragg gratings. However, passive grating models cannot be used to predict sensor performance using the important i...

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Detalles Bibliográficos
Autores principales: Wang, Bowen, Zhou, Yi, Guo, Zhihe, Wu, Xiang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6603634/
https://www.ncbi.nlm.nih.gov/pubmed/31195714
http://dx.doi.org/10.3390/s19112569
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author Wang, Bowen
Zhou, Yi
Guo, Zhihe
Wu, Xiang
author_facet Wang, Bowen
Zhou, Yi
Guo, Zhihe
Wu, Xiang
author_sort Wang, Bowen
collection PubMed
description The distributed feedback (DFB) laser is widely used in sensing because of its portable size, simple fabrication and high sensitivity. Most theoretical design models are based on passive Bragg gratings. However, passive grating models cannot be used to predict sensor performance using the important indicator of figure of merit (FOM) through theoretical calculations. To solve this problem, we replaced the passive grating with an active grating by using the imaginary part of the coupling constant that represents the value of the gain. As a comparison, the influence of the full width at half maximum (FWHM) and sensitivity were analyzed for different grating duty cycles and depths in the passive grating sensors. To obtain a higher FOM in the active grating sensors, we systematically investigated the effects of duty cycle and gain value through numerical simulations. We found that the redshift caused by a duty cycle increase can improve the sensitivity of biomolecule detection by 1.7 times.
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spelling pubmed-66036342019-07-17 Design for Distributed Feedback Laser Biosensors Based on the Active Grating Model Wang, Bowen Zhou, Yi Guo, Zhihe Wu, Xiang Sensors (Basel) Article The distributed feedback (DFB) laser is widely used in sensing because of its portable size, simple fabrication and high sensitivity. Most theoretical design models are based on passive Bragg gratings. However, passive grating models cannot be used to predict sensor performance using the important indicator of figure of merit (FOM) through theoretical calculations. To solve this problem, we replaced the passive grating with an active grating by using the imaginary part of the coupling constant that represents the value of the gain. As a comparison, the influence of the full width at half maximum (FWHM) and sensitivity were analyzed for different grating duty cycles and depths in the passive grating sensors. To obtain a higher FOM in the active grating sensors, we systematically investigated the effects of duty cycle and gain value through numerical simulations. We found that the redshift caused by a duty cycle increase can improve the sensitivity of biomolecule detection by 1.7 times. MDPI 2019-06-05 /pmc/articles/PMC6603634/ /pubmed/31195714 http://dx.doi.org/10.3390/s19112569 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Bowen
Zhou, Yi
Guo, Zhihe
Wu, Xiang
Design for Distributed Feedback Laser Biosensors Based on the Active Grating Model
title Design for Distributed Feedback Laser Biosensors Based on the Active Grating Model
title_full Design for Distributed Feedback Laser Biosensors Based on the Active Grating Model
title_fullStr Design for Distributed Feedback Laser Biosensors Based on the Active Grating Model
title_full_unstemmed Design for Distributed Feedback Laser Biosensors Based on the Active Grating Model
title_short Design for Distributed Feedback Laser Biosensors Based on the Active Grating Model
title_sort design for distributed feedback laser biosensors based on the active grating model
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6603634/
https://www.ncbi.nlm.nih.gov/pubmed/31195714
http://dx.doi.org/10.3390/s19112569
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