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Recent Trends of Optical Waveguide and Biophotonic Sensors
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Recent Trends of Optical Waveguide and Biophotonic Sensors

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

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 4772

Special Issue Editor

Prof. Dr. Yasufumi Enami

E-Mail Website
Guest Editor
Department of Electrical Engineering, Nagasaki University, 1-14 Bunkyomachi Nagasaki, Nagasaki 852-8521 Japan
Interests: optical waveguide; sensors and devices; biophotonic sensors; optical networks; micro and nano devices; and quantum optic sensors; optical devices for quantum computing and queantum communication.
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue aims to provide a comprehensive overview on the “Recent Trends of Optical Waveguide and Biophotonic Sensors”. Research articles which will provide a consolidated, up-to-date perspective in this area are invited. The Special Issue will publish full research, review, and other highly rated manuscripts addressing the above aim. Potential topics include, but are not limited to, the following:

  • Novel optical waveguide for biophotonic sensors;
  • Optical waveguide sensors;
  • Biophotobics sensors;
  • Quatum sensors for biophotonics;
  • Advanced manufacturing applications for biosensors;
  • Biomedical and human assistive applications.

Prof. Dr. Yasufumi Enami
Guest Editor

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 waveguide sensors
  • quantum sensors
  • biosensors

Published Papers (3 papers)

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Research

14 pages, 3349 KiB  
Article
Design of the Bimodal Grating Sensor with a Built-In Mode Demultiplexer
by Andrei Tsarev
Sensors 2023, 23(9), 4327; https://doi.org/10.3390/s23094327 - 27 Apr 2023
Cited by 1 | Viewed by 900
Abstract
This new sensor design provides good volume sensitivity (around 1600 nm/RIU) via collinear diffraction by the asymmetric grating placed in the waveguide vicinity. It provides the mode transformation between the fundamental TE0 and the first TE1 modes of the silicon wire [...] Read more.
This new sensor design provides good volume sensitivity (around 1600 nm/RIU) via collinear diffraction by the asymmetric grating placed in the waveguide vicinity. It provides the mode transformation between the fundamental TE0 and the first TE1 modes of the silicon wire (0.22 μm by a 0.580 μm cross-section) in the water environment. In order to provide the wavelength interrogation with a better extinction ratio for the measuring signal, the grating design is incorporated with the mode filter/demultiplexer. It selects, by the compact directional coupler (maximum 4 μm wide and 14 μm long), only the first guided mode (close to the cutoff) and transmits it with small excess loss (about −0.5 dB) to the fundamental TE0 mode of the neighboring single mode silicon wire, having variable curvature and width ranging from 0.26 μm to 0.45 μm. At the same time, the parasitic crosstalk of the input TE0 mode is below −42 dB, and that provides the option of simple and accurate wavelength sensor interrogation. The environment index is measured by the spectral peak position of the transmitted TE0 mode power in the output single mode silicon wire waveguide of the directional coupler. This type of optical sensor is of high sensitivity (iLOD~ 2.1 × 10−4 RIU for taking into account the water absorption at 1550 nm) and could be manufactured by modern technology and a single-step etching process. Full article
(This article belongs to the Special Issue Recent Trends of Optical Waveguide and Biophotonic Sensors)
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11 pages, 3994 KiB  
Article
Enhancing Evanescent Wave Coupling of Near-Surface Waveguides with Plasmonic Nanoparticles
by Jerome Lapointe, Alexandre Grégoire, Jean-Philippe Bérubé and Réal Vallée
Sensors 2023, 23(8), 3945; https://doi.org/10.3390/s23083945 - 13 Apr 2023
Cited by 1 | Viewed by 1712
Abstract
Evanescent field excitation is a powerful means to achieve a high surface-to-bulk signal ratio for bioimaging and sensing applications. However, standard evanescent wave techniques such as TIRF and SNOM require complex microscopy setups. Additionally, the precise positioning of the source relative to the [...] Read more.
Evanescent field excitation is a powerful means to achieve a high surface-to-bulk signal ratio for bioimaging and sensing applications. However, standard evanescent wave techniques such as TIRF and SNOM require complex microscopy setups. Additionally, the precise positioning of the source relative to the analytes of interest is required, as the evanescent wave is critically distance-dependent. In this work, we present a detailed investigation of evanescent field excitation of near-surface waveguides written using femtosecond laser in glass. We studied the waveguide-to-surface distance and refractive index change to attain a high coupling efficiency between evanescent waves and organic fluorophores. First, our study demonstrated a reduction in sensing efficiency for waveguides written at their minimum distance to the surface without ablation as the refractive index contrast of the waveguide increased. While this result was anticipated, it had not been previously demonstrated in the literature. Moreover, we found that fluorescence excitation by waveguides can be enhanced using plasmonic silver nanoparticles. The nanoparticles were also organized in linear assemblies, perpendicular to the waveguide, with a wrinkled PDMS stamp technique, which resulted in an excitation enhancement of over 20 times compared to the setup without nanoparticles. Full article
(This article belongs to the Special Issue Recent Trends of Optical Waveguide and Biophotonic Sensors)
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15 pages, 23065 KiB  
Article
Optoelectronic Pressure Sensor Based on the Bending Loss of Plastic Optical Fibers Embedded in Stretchable Polydimethylsiloxane
by Alberto Alonso Romero, Koffi Novignon Amouzou, Dipankar Sengupta, Camila Aparecida Zimmermann, Andréane Richard-Denis, Jean-Marc Mac-Thiong, Yvan Petit, Jean-Marc Lina and Bora Ung
Sensors 2023, 23(6), 3322; https://doi.org/10.3390/s23063322 - 22 Mar 2023
Cited by 4 | Viewed by 1573
Abstract
We report the design and testing of a sensor pad based on optical and flexible materials for the development of pressure monitoring devices. This project aims to create a flexible and low-cost pressure sensor based on a two-dimensional grid of plastic optical fibers [...] Read more.
We report the design and testing of a sensor pad based on optical and flexible materials for the development of pressure monitoring devices. This project aims to create a flexible and low-cost pressure sensor based on a two-dimensional grid of plastic optical fibers embedded in a pad of flexible and stretchable polydimethylsiloxane (PDMS). The opposite ends of each fiber are connected to an LED and a photodiode, respectively, to excite and measure light intensity changes due to the local bending of the pressure points on the PDMS pad. Tests were performed in order to study the sensitivity and repeatability of the designed flexible pressure sensor. Full article
(This article belongs to the Special Issue Recent Trends of Optical Waveguide and Biophotonic Sensors)
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