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Emerging Trends in Optical Sensing

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

Deadline for manuscript submissions: closed (25 March 2026) | Viewed by 4943

Special Issue Editor


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Guest Editor
Chemistry, KU Leuven, Leuven, Belgium
Interests: nonlinear optics; plasmonics; scattering; spectroscopy; biological interfaces; optical read-out
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue highlights emerging trends in optical sensing, focusing on advanced materials for enhanced light-matter interactions, including the detection and analysis of chiral properties. Optical sensing spans a broad spectrum of techniques, such as Faraday effects, luminescence (fluorescence, phosphorescence, and chemiluminescence), nonlinear optical phenomena, and photonic crystal-based approaches. We invite contributions that advance the understanding, design, methodology, and application of optical sensors, particularly those which could be eventually applied in life-sciences. Studies focused on the role of chirality, both through photon spin- and orbital angular momentum, in light-matter interactions and their implications for sensing are strongly encouraged.

Join us in showcasing the latest breakthroughs and paving the way for future innovations in this dynamic and interdisciplinary field.

Dr. Yovan de Coene
Guest Editor

Manuscript Submission Information

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Keywords

  • optical sensors
  • chirality
  • Faraday effect
  • photonic crystals
  • metastructures
  • luminescence
  • nanoparticles
  • nonlinear optics
  • spin angular momentum
  • orbital angular momentum

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Published Papers (2 papers)

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Research

29 pages, 7214 KB  
Article
Quantitative Analysis of Phase Response Enhancement in Distributed Acoustic Sensing Systems Using Helical Fiber Winding Technology
by Yuxing Duan, Shangming Du, Tianwei Chen, Can Guo, Song Wu and Lei Liang
Sensors 2025, 25(23), 7289; https://doi.org/10.3390/s25237289 - 29 Nov 2025
Viewed by 1290
Abstract
In this paper, we investigate the physical mechanics of vibration wave detection in distributed acoustic sensing (DAS) systems with the aim of enhancing the interpretation of the quantitative wavefield. We investigate the nonlinear relationship of DAS gauge length and pulse width on the [...] Read more.
In this paper, we investigate the physical mechanics of vibration wave detection in distributed acoustic sensing (DAS) systems with the aim of enhancing the interpretation of the quantitative wavefield. We investigate the nonlinear relationship of DAS gauge length and pulse width on the seismic wave response, and the result is explained by the trigonometric relationship of backscattered Rayleigh wave phases. We further demonstrate the influence of spiral winding on DAS performance and also build phase response models for P-waves and S-waves in helically wound cables. These models suggest that the winding angle controls the measurement interval spacing and the angle of wave incidence. Additionally, integration of structural reinforcement improves the amplitude response characteristics and SNR. The experimentally inspired results show, using simulations and field tests, that the same vibration sources can give helically wound cables with larger winding angles the largest phase amplitudes, which would substantially exceed that of straight cables. SNR increased significantly (approximately 10% to 30%). The efficacy of the method was also checked using experiments for different vibration amplitudes and frequencies. Such results provide evidence for the design and installation of fiber-optic cables for use in practical engineering applications involving safety monitoring. Full article
(This article belongs to the Special Issue Emerging Trends in Optical Sensing)
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14 pages, 1529 KB  
Article
Luminescence Lifetime-Based Water Conductivity Sensing Using a Cationic Dextran-Supported Ru(II) Polypyridyl Complex
by Ya Jie Knöbl, Lauren M. Johnston, José Quílez-Alburquerque and Guillermo Orellana
Sensors 2025, 25(1), 121; https://doi.org/10.3390/s25010121 - 28 Dec 2024
Cited by 2 | Viewed by 3005
Abstract
Water conductivity sensing relies universally on electrical measurements, which are subject to corrosion of the electrodes and subsequent signal drift in prolonged in situ uses. Furthermore, they cannot provide contactless sensing or remote readout. To this end, a novel device for water conductivity [...] Read more.
Water conductivity sensing relies universally on electrical measurements, which are subject to corrosion of the electrodes and subsequent signal drift in prolonged in situ uses. Furthermore, they cannot provide contactless sensing or remote readout. To this end, a novel device for water conductivity monitoring has been developed by employing a microenvironment-sensitive ruthenium complex, [Ru(2,2′-bipyridine-4,4′-disulfonato)3]4−, embedded into a quaternary ammonium functionalized cross-linked polymer support. The degree of swelling of the latter, which leads to a change in the emission lifetime, depends on the water conductivity. The sensor displays a reversible response (2 min ≤ t90 ≤ 3 min) and has been shown to be stable for >65 h of continuous monitoring of 0.8–12.8 mS cm−1 KCl solutions. Changes to the cation do not affect the sensor response, while changes to the anion type induce small effects. Variations in the dissolved O2 or temperature require corrections of the response. The sensor can be interrogated alongside dissolved O2 and pH luminescent sensors based on the same family of indicator dyes to exploit the definite advantages of luminescence lifetime-based detection. Full article
(This article belongs to the Special Issue Emerging Trends in Optical Sensing)
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