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Optical Micro-Resonators for Sensing
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Optical Micro-Resonators for Sensing

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

Deadline for manuscript submissions: closed (31 August 2020) | Viewed by 7231

Special Issue Editor

Dr. Pablo Bianucci

E-Mail Website
Guest Editor
Department of Physics, Concordia University, 7141 Sherbrooke W. Montreal, H4B 1R6 QC, Canada
Interests: physics and applications of nano- and micro-photonic devices; optical properties of nanomaterials; interaction of nanomaterials with optical resonators; applications of optical resonators

Special Issue Information

Dear Colleagues,

Optical resonators are firmly settled now in the frontier of research into ever more sensitive transducers. They can be used to convert changes in properties such as temperature, pressure, strain, refractive index, or the presence of specific molecules into a quantifiable optical signal. The enhanced interaction of the light with the medium to be sensed in the resonator, results in an increase of the sensitivity, which has led to the demonstration of ever decreasing detection limits.

The goal of this Special Issue is to bring together recent developments in the field of sensors based on optical resonators. Our aim is to collect both comprehensive reviews of the latest research and exciting new developments, which will be of interest to a broad audience.

For the issue, we invite articles discussing any aspect, theoretical or experimental, of using optical micro-resonators as sensing elements. Appropriate topics include (but are not limited to) novel implementations of optical micro-resonator sensors, studies of sensing mechanisms, characterizing and improving detection limits, device optimization, and packaging.

Dr. Pablo Bianucci
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

  • Whispering gallery modes
  • Microring
  • Microsphere
  • Microdisk
  • Microbottle
  • Photonic crystal cavity

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Published Papers (2 papers)

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13 pages, 8118 KiB  
Article
Characteristics of Highly Sensitive Hydrogen Sensor Based on Pt-WO3/Si Microring Resonator
by Sosuke Matsuura, Naoki Yamasaku, Yoshiaki Nishijima, Shinji Okazaki and Taro Arakawa
Sensors 2020, 20(1), 96; https://doi.org/10.3390/s20010096 - 23 Dec 2019
Cited by 21 | Viewed by 3837
Abstract
Hydrogen gas has attracted attention as a new energy carrier, and simple but highly sensitive hydrogen sensors are required. We fabricated an optical hydrogen sensor based on a silicon microring resonator (MRR) with tungsten oxide (WO3) using a complementary metal-oxide-semiconductor (CMOS)-compatible [...] Read more.
Hydrogen gas has attracted attention as a new energy carrier, and simple but highly sensitive hydrogen sensors are required. We fabricated an optical hydrogen sensor based on a silicon microring resonator (MRR) with tungsten oxide (WO3) using a complementary metal-oxide-semiconductor (CMOS)-compatible process for the MRR and a sol-gel method for the WO3 layer and investigated its sensing characteristics at device temperatures of 5, 20, and 30 °C. At each temperature, a hydrogen concentration of as low as 0.1 vol% was successfully detected. The gas sensitivity increased with decreasing temperature. The dependence of the sensitivity on the device temperature can be attributed to the thickness of tungsten bronze (HxWO3) formed by WO3 during exposure to hydrogen gas. In addition, a hydrogen gas sensor based on a silicon-MRR-enhanced Mach–Zehnder interferometer (MRR-MZI) is proposed and its significantly high sensing ability using improved changes in the transmittance of light is theoretically discussed. Full article
(This article belongs to the Special Issue Optical Micro-Resonators for Sensing)
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Other

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8 pages, 1072 KiB  
Letter
Three-Dimensional Simulation of Particle-Induced Mode Splitting in Large Toroidal Microresonators
by Lei Chen, Cheng Li, Yumin Liu, Judith Su and Euan McLeod
Sensors 2020, 20(18), 5420; https://doi.org/10.3390/s20185420 - 22 Sep 2020
Cited by 6 | Viewed by 2921
Abstract
Whispering gallery mode resonators such as silica microtoroids can be used as sensitive biochemical sensors. One sensing modality is mode-splitting, where the binding of individual targets to the resonator breaks the degeneracy between clockwise and counter-clockwise resonant modes. Compared to other sensing modalities, [...] Read more.
Whispering gallery mode resonators such as silica microtoroids can be used as sensitive biochemical sensors. One sensing modality is mode-splitting, where the binding of individual targets to the resonator breaks the degeneracy between clockwise and counter-clockwise resonant modes. Compared to other sensing modalities, mode-splitting is attractive because the signal shift is theoretically insensitive to the polar coordinate where the target binds. However, this theory relies on several assumptions, and previous experimental and numerical results have shown some discrepancies with analytical theory. More accurate numerical modeling techniques could help to elucidate the underlying physics, but efficient 3D electromagnetic finite-element method simulations of large microtoroid (diameter ~90 µm) and their resonance features have previously been intractable. In addition, applications of mode-splitting often involve bacteria or viruses, which are too large to be accurately described by the existing analytical dipole approximation theory. A numerical simulation approach could accurately explain mode splitting induced by these larger particles. Here, we simulate mode-splitting in a large microtoroid using a beam envelope method with periodic boundary conditions in a wedge-shaped domain. We show that particle sizing is accurate to within 11% for radii a<λ/7, where the dipole approximation is valid. Polarizability calculations need only be based on the background media and need not consider the microtoroid material. This modeling approach can be applied to other sizes and shapes of microresonators in the future. Full article
(This article belongs to the Special Issue Optical Micro-Resonators for Sensing)
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