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Recent Advances in Micro- and Nanofiber-Optic Sensors
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Recent Advances in Micro- and Nanofiber-Optic Sensors

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

Deadline for manuscript submissions: 31 December 2024 | Viewed by 1727

Special Issue Editors

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. 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. 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

Special Issue Information

Dear Colleagues,

Micro-/nanofibers (MNFs) with significantly reduced fiber diameters are very popular in the development of miniaturized fiber-optic sensors with high sensitivity and fast response times. MNFs offer a large portion of the evanescent field and high-intensity surface fields, and the enhancement of the light–matter interaction makes them highly sensitive to refractive index change in the surrounding medium. We propose the use of micro-/nanoprocessing technologies in the fabrication of MNFs. Examples of such techniques include adiabatic taper, chemical etching and femtosecond laser processing.

A number of optical ring resonators, microfiber couplers, grating sensors, WGM sensors, and surface plasmon resonance (SPR) sensors based on MNFs have been proposed and extensively investigated. Further functionalization of the MNFs sensor structures with additional coating materials (nanomaterials, 2D materials) could significantly improve its sensing properties, allowing us to achieve high sensitivity and selectivity detection for the desired targets. MNF sensors have become among the most promising fiber-optic sensors and have wide applications in physical and bio-chemical applications, such as taking measurements of temperature, strain, vibration, relative humidity, and gas/liquid concentrations, and detecting biomolecules. The purpose of this Special Issue is to publish papers that reflect the most recent advancements in MNFs sensors. Scholars should submit fundamental research, innovative applications and review articles. Topics include, but are not limited to:

  • MNFs interferometer sensors;
  • MNFs resonators;
  • MNFs SPR sensors;
  • MNFs fabrication technology;
  • Coating materials functionalized of MNFs for sensing applications;
  • Microstructure optical fiber-based sensor devices/systems
  • Lab-on-fiber sensor devices/systems;
  • Emerging MNFs sensing device design and applications;
  • MNFs sensors in physical, biochemical, biomedical applications etc.

Dr. Dejun Liu
Dr. Qiang Wu
Dr. Ke Tian
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

  • optical fiber sensors
  • micro-/nanofibers
  • microstructure optical fibers
  • SPR sensors
  • biochemical sensors
  • gas sensors

Published Papers (2 papers)

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Research

9 pages, 2639 KiB  
Communication
Femtosecond Laser Inscribed Excessively Tilted Fiber Grating for Humidity Sensing
by Liqing Jing, Bonan Liu, Dejun Liu, Dan Liu, Famei Wang, Chunying Guan, Yiping Wang and Changrui Liao
Sensors 2024, 24(2), 342; https://doi.org/10.3390/s24020342 - 06 Jan 2024
Viewed by 751
Abstract
We propose a humidity sensor using an excessively tilted fiber grating (Ex-TFG) coated with agarose fabricated using femtosecond laser processing. The processed grating showcases remarkable differentiation between TE and TM modes, achieving an exceptionally narrow bandwidth of approximately 1.5 nm and an impressive [...] Read more.
We propose a humidity sensor using an excessively tilted fiber grating (Ex-TFG) coated with agarose fabricated using femtosecond laser processing. The processed grating showcases remarkable differentiation between TE and TM modes, achieving an exceptionally narrow bandwidth of approximately 1.5 nm and an impressive modulation depth of up to 15 dB for both modes. We exposed the agarose-coated TFG sensor to various relative humidity levels and monitored the resonance wavelength to test its humidity sensing capability. Our findings demonstrated that the sensor exhibited a rapid response time (2–4 s) and showed a high response sensitivity (18.5 pm/%RH) between the humidity changes and the resonant wavelength shifts. The high sensitivity, linearity, repeatability, low hysteresis, and excellent long-term stability of the TFG humidity sensor, as demonstrated in our experimental results, make it an attractive option for environmental monitoring or biomedical diagnosis. Full article
(This article belongs to the Special Issue Recent Advances in Micro- and Nanofiber-Optic Sensors)
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9 pages, 2221 KiB  
Communication
Simultaneous Measurement of Microdisplacement and Temperature Based on Balloon-Shaped Structure
by Yaxun Zhang, Yuxin Liu, Zhiliang Huang, Pingbang Huang, Xiaoyun Tang, Zhihai Liu, Yu Zhang and Libo Yuan
Sensors 2023, 23(20), 8521; https://doi.org/10.3390/s23208521 - 17 Oct 2023
Viewed by 699
Abstract
An optical fiber sensor for the simultaneous measurement of microdisplacement and temperature based on balloon-shaped single-mode fibers cascaded with a fiber Bragg grating with two core-offset joints is proposed. The interference between the core mode and cladding mode is caused by the stimulation [...] Read more.
An optical fiber sensor for the simultaneous measurement of microdisplacement and temperature based on balloon-shaped single-mode fibers cascaded with a fiber Bragg grating with two core-offset joints is proposed. The interference between the core mode and cladding mode is caused by the stimulation of the cladding mode by the core-offset joints’ structure. The cladding of the core has a distinct refractive index, which causes optical path differences and interference. The balloon-shaped structure realizes mode selection by bending. As the displacement increases, the radius of the balloon-shaped interferometer changes, resulting in a change in the interference fringes of the interferometer, while the Bragg wavelength of the fiber grating remains unchanged. Temperature changes will cause the interference fringes of the interferometer and the Bragg wavelength of the fiber grating to shift. The proposed optical fiber sensor allows for the simultaneous measurement of microdisplacement and temperature. The results of the experiment indicate that the sensitivity of the interferometer to microdisplacement is 0.306 nm/µm in the sensing range of 0 to 200 μm and that the temperature sensitivity is 0.165 nm/°C, respectively. The proposed curvature sensor has the advantages of a compact structure, extensive spectrum of dynamic measurement, high sensitivity, and simple preparation, and has a wide range of potential applications in the fields of structural safety monitoring, aviation industry, and resource exploration. Full article
(This article belongs to the Special Issue Recent Advances in Micro- and Nanofiber-Optic Sensors)
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