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Design and Fabrication of Fiber Optic Sensors for Bio-Chemical Sensing...
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Design and Fabrication of Fiber Optic Sensors for Bio-Chemical Sensing Applications

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Optical Sensors".

Deadline for manuscript submissions: 25 December 2025 | Viewed by 2665

Special Issue Editors

Dr. Qiang Wu

E-Mail Website
Guest Editor
Physics and Electrical Engineering, Northumbria University, Newcastle Upon Tyne NE1 8ST, UK
Interests: optical fiber interferometers for novel fiber optical couplers and sensors; nanofiber; microsphere sensors for bio-chemical sensing; the design and fabrication of fiber bragg grating devices and their applications for sensing; nonlinear fibre optics; surface plasmon resonant and surface acoustic wave sensors
Special Issues, Collections and Topics in MDPI journals
Dr. Dejun Liu

E-Mail Website
Guest Editor
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Interests: optical fiber sensors; fiber interferometer sensors; microfiber and special fiber-based sensor fabrication and application; optical-fiber-based gas sensors and biochemical sensors; laser fabrication techniques; fiber endoscope
Special Issues, Collections and Topics in MDPI journals
Dr. Ke Tian

E-Mail Website
Guest Editor
Key Lab of In-Fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin 150001, China
Interests: fiber-optic sensors; nonlinear fiber optics; optical soliton
Special Issues, Collections and Topics in MDPI journals
Dr. Bin Liu

E-Mail Website
Guest Editor
National Engineering Laboratory for Destructive Testing and Optoelectronic Sensing Technology and Application, Nanchang Hangkong University, Nanchang 330063, China
Interests: fiber optic sensor; nonlinear fiber optics; optical soliton

Special Issue Information

Dear Colleagues,

Bio-chemical sensing is significantly important in a number of applications, such as in medical diagnostics, environmental monitoring, industrial applications, food safety, and security. Fiber optic technology, which is considered to be one of the most promising sensing techniques for bio-chemical sensing has been extensively studied in past decades due to its advantages of a small size, low cost, label-free features, high sensitivity, immunity to electromagnetic interference and ionizing radiation, distributed sensing and remote sensing capabilities. A number of fiber optic bio-chemical sensors based on WGM, fiber interferometers, surface plasmon resonances (SPR), fluorescence, absorption, optical fiber optofluidic lasers (FOFL), surface-enhanced Raman scattering (SERS) and fiber microfluidic sensing technics have been reported. This Special Issue aims to provide an up-to-date overview on the recent advances and challenges in the design and fabrication of fiber optic bio-chemical sensors and sensing systems.

Potential topics include but are not limited to: the fiber optic sensing of explosives, bacteria, viruses, biological markers, nucleic acid, heavy metal ions, pollutants, PH, gases and fiber microfluidic sensing devices.

Dr. Qiang Wu
Dr. Dejun Liu
Dr. Ke Tian
Dr. Bin Liu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • fiber optic sensors
  • fiber interferometers
  • surface plasmon resonances (SPR) sensors
  • bio-chemical sensors
  • gas sensors
  • fluorescence sensors
  • acoustic wave sensors
  • microfluidic sensors

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Published Papers (3 papers)

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Research

13 pages, 5617 KiB  
Article
Directional Torsion Sensor Based on a Paired Helical-Type Multimode Fiber
by Wenlei Yang, Ke Tian and Le Li
Sensors 2025, 25(7), 2091; https://doi.org/10.3390/s25072091 - 27 Mar 2025
Viewed by 299
Abstract
A torsion sensor with directional discrimination based on a single-mode–twisted multimode–single-mode (STMS) fiber structure is demonstrated. The STMS fiber structure is fabricated by fusion-splicing a segment of multimode fiber (MMF) between two single-mode fibers (SMFs), where the MMF is simultaneously heated and twisted [...] Read more.
A torsion sensor with directional discrimination based on a single-mode–twisted multimode–single-mode (STMS) fiber structure is demonstrated. The STMS fiber structure is fabricated by fusion-splicing a segment of multimode fiber (MMF) between two single-mode fibers (SMFs), where the MMF is simultaneously heated and twisted to form paired helical-type structures. The experimental results indicate that the resonance wavelength shifts towards shorter wavelengths as the twist rate increases in the clockwise direction, while an opposite shift occurs in the counterclockwise direction. Within a twist rate range of −5.2 rad/m~5.2 rad/m, the wavelength and transmission sensitivities are determined to be −1.38 nm/rad·m−1 and 3.12 dB/rad·m−1, respectively. Furthermore, the proposed twist sensor exhibits minimal temperature crosstalk of 0.0072 (rad/m)/°C, making it highly desirable for mitigating temperature-induced cross-sensitivity in torsion measurement applications. Full article
(This article belongs to the Special Issue Design and Fabrication of Fiber Optic Sensors for Bio-Chemical Sensing Applications)
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12 pages, 8770 KiB  
Article
Optimization of Magnetoplasmonic Behavior in Ag/Fe Bilayer Nanostructures Towards Refractometric Sensing
by João Pedro Miranda Carvalho, Bernardo S. Dias, Luís C. C. Coelho and José M. M. M. de Almeida
Sensors 2025, 25(5), 1419; https://doi.org/10.3390/s25051419 - 26 Feb 2025
Viewed by 360
Abstract
Magneto-optic surface plasmon resonances (MOSPRs) rely on the interaction of magnetic fields with surface plasmon polaritons (SPP) to modulate plasmonic bands with magnetic fields and enhance magneto-optical activity. In the present work, a study on the magnetoplasmonic behavior of Ag/Fe bilayers is carried [...] Read more.
Magneto-optic surface plasmon resonances (MOSPRs) rely on the interaction of magnetic fields with surface plasmon polaritons (SPP) to modulate plasmonic bands with magnetic fields and enhance magneto-optical activity. In the present work, a study on the magnetoplasmonic behavior of Ag/Fe bilayers is carried out by VIS-NIR spectroscopy and backed with SQUID measurements, determining the thickness-dependent magnetization of thin-film samples. The MOSPR sensing properties of Ag/Fe planar bilayers are simulated using Berreman’s matrix formalism, from which an optimized structure composed of 15 nm of Ag and 12.5 nm of Fe is obtained. The selected structure is fabricated and characterized for refractive index (RI) sensitivity, reaching 4946 RIU−1 and returning an effective enhancement of refractometric sensitivity after magneto-optical modulation. A new optimized and cobalt-free magnetoplasmonic Ag/Fe bilayer structure is studied, fabricated, and characterized for the first time towards refractometric sensing, to the best of our knowledge. This configuration exhibits potential for enhancing refractometric sensitivity via magneto-optical modulation, thus paving the way towards a simpler, more accessible, and safe type of RI sensor with potential applications in chemical sensors and biosensors. Full article
(This article belongs to the Special Issue Design and Fabrication of Fiber Optic Sensors for Bio-Chemical Sensing Applications)
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12 pages, 5661 KiB  
Communication
Light-Sheet Skew Ray-Based Microbubble Chemical Sensor for Pb2+ Measurements
by Tingting Zhuang, Lukui Xu, Mamoona Khalid, Xuan Wu, Linqiao Du, Soroush Shahnia, Christophe A. Codemard, Zhiyong Bai, Ying Wang, Shen Liu, George Y. Chen and Yiping Wang
Sensors 2024, 24(21), 6785; https://doi.org/10.3390/s24216785 - 22 Oct 2024
Viewed by 1137
Abstract
A multimode fiber-based sensor is proposed and demonstrated for the detection of lead traces in contaminated water. The sensing mechanism involves using a light sheet to excite a specific group of skew rays that optimizes light absorption. The sensing region features an inline [...] Read more.
A multimode fiber-based sensor is proposed and demonstrated for the detection of lead traces in contaminated water. The sensing mechanism involves using a light sheet to excite a specific group of skew rays that optimizes light absorption. The sensing region features an inline microbubble structure that funnels the skew rays into a tight ring, thereby intensifying the evanescent field. The sensitivity is further refined by incorporating gold nanoparticles, which amplify the evanescent field strength through localized surface plasmon resonance. The gold nanoparticles are functionalized with oxalic acid to improve specificity for lead ion detection. Experiment results demonstrated the significantly enhanced absorption sensitivity of the proposed sensing method for large center offsets, achieving a detection limit of 0.1305 ng/mL (the World Health Organization safety limit is 10 ng/mL) for concentrations ranging from 0.1 to 10 ng/mL. Full article
(This article belongs to the Special Issue Design and Fabrication of Fiber Optic Sensors for Bio-Chemical Sensing Applications)
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