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Special Issue "Editorial Board Members’ Collection Series: Photonics Sensors"

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A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: 10 July 2023 | Viewed by 2780

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Special Issue Editors

Dr. Carlos Marques

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Guest Editor

Department of Physics and I3N, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
Interests: photonics; optics for aerospace; optical sensors; optical devices; machine learning for optics
Special Issues, Collections and Topics in MDPI journals

Dr. Flavio Esposito

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Guest Editor

Dept. of Engineering, University of Naples “Parthenope” Centro Direzionale Isola C4, 80143 Napoli, Italy
Interests: chemical sensors; biosensors; physical sensors; fiber-optic sensors; fiber gratings; long period gratings; fiber Bragg gratings; fabrication of long period gratings (LPG) in specialty optical fibers; investigation of fiber optic sensors under different ionizing radiations; development of fiber optic bio-chemical sensors for industrial and medical applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Photonics sensors have attracted wide interest in countless domains, including aerospace, food processing, high-energy physics experiments, environmental monitoring, medicine, the nuclear industry, oil and gas, railways, and structural health monitoring. Here, photonics sensors bring several advantages, such as high-sensitivity and -resolution measurements, small size and weight, immunity to electromagnetic interferences, resistance to harsh environments, long-distance monitoring, and high multiplexing capability.

This Special Issue will focus on the latest developments and trends in photonics sensors, covering recent improvements in related theory, design, fabrication, and application/validation. We encourage you to submit original research papers, communications, and review articles in order to provide a useful insight into the present status and future outlooks in this area. We look forward to receiving your contributions.

Dr. Carlos Marques
Dr. Flavio Esposito
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. Photonics is an international peer-reviewed open access monthly 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 1800 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
interferometric sensors
resonance-based sensors
plasmonic sensors
fluorescence
luminescence
absorption
spectroscopy
physical sensors
mechanical sensors
chemical sensors and biosensors
nanostructured materials and coatings
surface functionalization procedures
microfluidics
lab on chip
sensor packaging
sensor interrogation and instrumentation

Published Papers (4 papers)

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Research

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Open AccessArticle

Through-The-Coating Fabrication of Fiber Bragg Grating Relative Humidity Sensors Using Femtosecond Pulse Duration Infrared Lasers and a Phase Mask

and

Photonics 2023, 10(6), 625; https://doi.org/10.3390/photonics10060625 - 29 May 2023

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Abstract

Fiber Bragg grating (FBG) relative humidity (RH) sensors are fabricated in commercially available polyimide (PI)-coated optical fibers with diameters of 50 and 125 μm. Infrared (800 nm) femtosecond pulse duration laser pulses and a phase mask are used to inscribe Type-I and Type-II FBGs directly through the protective polyimide coatings of both 50 and 125 μm diameter fibers without typical fiber processing such as hydrogen loading, cryogenic storage, stripping, recoating or annealing. The devices are then evaluated for their performance as humidity sensors. At telecom wavelengths, the 50 μm diameter fiber devices with a 10 μm thick PI coating had a wavelength shift of the Bragg resonance at a constant temperature of 2.7 pm/%RH, whereas the 125 μm diameter fiber devices with a 17 μm thick PI coating had a wavelength shift of 1.8 pm/%RH. The humidity sensors in the 50 µm diameter fiber demonstrated a more rapid response time to small changes in humidity and a weaker hysteresis when compared to the 125 µm diameter fiber devices. No modification to the PI coatings was observed during fabrication. No difference in RH sensitivity was observed for Type-I devices when compared with Type-II devices with the same fiber. The applicability of this approach for fabricating distributed RH sensing arrays with hundreds of sensing elements on a single fiber is discussed. Full article

(This article belongs to the Special Issue Editorial Board Members’ Collection Series: Photonics Sensors)

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Open AccessArticle

Remote Operation of an Open-Path, Laser-Based Instrument for Atmospheric CO₂ and CH₄ Monitoring

Panagiotis Siozos

Giannis Psyllakis

and

Michalis Velegrakis

Photonics 2023, 10(4), 386; https://doi.org/10.3390/photonics10040386 - 31 Mar 2023

Cited by 1 | Viewed by 654

Abstract

The technical specifications and the evaluation of the remote operation of the open-path, tunable diode laser absorption spectroscopic (TDLAS) instrument are presented. The instrument is equipped with two low optical power diode lasers in the near-infrared spectral range for the atmospheric detection of carbon dioxide, methane, and water vapors (CO₂, CH_4, and H₂O). Additionally, the instrument eliminates the requirement of retroreflectors since it detects the back reflection of the laser beam from any topographic target. The instrument was operated remotely by measuring background concentrations of CO₂ and CH₄ in the atmosphere from 24 November 2022 to 4 January 2023. The accuracy of CO₂ and CH₄ measurement retrievals on a 200 m laser path was estimated at 20 ppm (4.8%) and 60 ppb (3.1%), respectively. The CH₄ accuracy is comparable, but the CO₂ accuracy is noticeably lower than the accuracy achieved in local operation. The accuracy issues raised are studied and discussed in terms of the laser driver’s cooling performance. Full article

(This article belongs to the Special Issue Editorial Board Members’ Collection Series: Photonics Sensors)

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Open AccessArticle

Silica-Titania Integrated Photonics Platform-Based 1 × 2 Demultiplexer Utilizing Two Serially Cascaded Racetrack Microrings for 1310 nm and 1550 nm Telecommunication Wavelengths

and

Photonics 2023, 10(2), 208; https://doi.org/10.3390/photonics10020208 - 14 Feb 2023

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Abstract

Herein, a numerical analysis of a 1 × 2 demultiplexer based on a silica-titania integrated photonics platform is conducted via the finite element method. The structure is composed of two coupled racetrack microrings (RTMRs) and a subwavelength grating (SWG) structure for the demultiplexing of 1310 nm and 1550 nm telecommunication wavelengths. The material platform selected for this design is highly attractive due to its refined optical, physical, and chemical properties. Moreover, silica-titania sol-gel thin-films can be deposited on glass substrates with the dip-coating method. The proposed device has a small footprint of 84 × 125 μm² and offers crosstalk as low as ~−6.6 dB and ~−9.04 dB for 1550 nm and 1310 nm, respectively. We are convinced that this study promotes the use of the silica-titania platform for the development of low-cost on-chip optical communication devices for signal multiplexing and demultiplexing. Full article

(This article belongs to the Special Issue Editorial Board Members’ Collection Series: Photonics Sensors)

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Review

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Open AccessReview

Overview of Addressed Fiber Bragg Structures’ Development

and

Photonics 2023, 10(2), 175; https://doi.org/10.3390/photonics10020175 - 07 Feb 2023

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Abstract

An addressed fiber Bragg structure (AFBS) is a special type of fiber Bragg grating simultaneously performing the functions of a two-frequency radiation shaper and a sensitive element. An AFBS forms a two-frequency optical spectral response at its output, the difference frequency of which is invariant to measured physical fields and is referred to as the address frequency of the AFBS. Each of the AFBSs in the system has its own address frequency; therefore, a number of such structures can be interrogated simultaneously enabling the addressed multiplexing. In this article, we provide an overview of the theory and technology of AFBS, including the structures with three or more spectral components with various combinations of difference frequencies, both symmetrical and asymmetric. The subjects of interrogation of AFBSs, their fabrication and calibration are discussed as well. We also consider a wide range of applications in which AFBS can be used, covering such areas as oil and gas production, power engineering, transport, medicine, etc. In addition, the prospects for the further development of AFBS are proposed that mitigate the shortcomings of the current AFBSs’ state of the art and open up new possibilities of their application. Full article

(This article belongs to the Special Issue Editorial Board Members’ Collection Series: Photonics Sensors)

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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: An FBG-Based Hard Landing Monitoring System: a preliminary assessment for drops on different grounds
Authors: A. Brindisi; C. Vendittozzi; L. Travascio; M. Belardo; M. Ignarra; V. Fiorillo; A. Concilio
Affiliation: CIRA and the University of Brasilia
Abstract: The activity deals with an integrated system with an FBG-sensor network, capable of recording the structural response of a Landing Gear under operational loads. The focus of the paper concerns the measurements of dynamic strains following hard landing (HL) conditions, even considered for weight on wheel (WoW) detection. Experiments were carried out by dropping a leaf spring LG from a lab tower and impacting different soil types: hard, sand and gravel.

Title: Optimisation of adhesive bonding on dynamic and static strain transfers for fibre optic sensors
Authors: C. Landreau; J. Vidalot; A. Morana; N. Ponthus; T. Le Gall; S. Girard; J. Charvin; E. Marin
Affiliation: Laboratoire Hubert Curien, CNRS UMR 5516, Université de Lyon, 42000 Saint-Étienne, France
Abstract: The effect of the glue type on static and dynamic strain transfers of bonded optical fibre sensors is studied. Different types of adhesives are tested on acrylate-coated, high temperature acrylate-coated, polyimide-coated and uncoated Fluor doped optical fibres. Static strain measurements are made using both Fibre Bragg Gratings (FBGs) and Optical Frequency Domain Reflectometry (OFDR), and are compared to reference strain-gauge measurements and to a numerical model. Regarding the dynamic strain measurements only the FBGs are tested. The preliminary results show that strain sensors based on bonded fibres can be as sensitive as strain-gauges.

Title: Distributed strain measurement based on Rayleigh scattering in the presence of a fiber Bragg grating in an optical fiber
Authors: V. Matveenko; G. Serovaev
Affiliation: Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science
Abstract: /

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