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Optical–Resonant Microsensors
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Optical–Resonant Microsensors

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

Deadline for manuscript submissions: closed (31 May 2020) | Viewed by 18517

Special Issue Editor

Prof. Dr. Stephen Holler

E-Mail Website
Guest Editor
Department of Physics & Engineering Physics, Fordham University, Freeman Hall B06A, 441 E. Fordham Road, Bronx, NY 10458, USA
Interests: biological sensor development; environmental sensing; micro-optical sensors; whispering gallery mode biosensors; microcavity photonics; light scattering from bio-aerosols; fluorescence and absorption spectroscopy; cavity ringdown spectroscopy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Resonance phenomena are manifest throughout nature. Due to their sharp responses and ability to amplify signals to measurable levels, resonant systems can be leveraged as highly sensitive and effective sensor platforms. The development of novel microscale sensors that elicit measurable responses to a wide variety of trace analytes down to single molecule levels and various mechanical processes such as stress, strain, and temperature have been an active area of research.

This Special Issue on resonant optical microsensors seeks to aggregate the diverse and vibrant research in this exciting area. Our goal is to bring together varied research in biological, chemical, and mechanical sensing to showcase the widespread applicability of such systems, understand new devices and sensing approaches, and offer readers scientific and technical depth that may seed new and/or cross-disciplinary ideas. To this end, we are soliciting manuscripts for a Special Issue that focuses on both theoretical and experimental concepts for the development of new resonant optical microsensors applications and technology. The variety of approaches can include but is not limited to platforms that are based on microcavities, utilize fluorescence, Raman, absorption spectroscopy or other optical techniques. Such sensor platforms are ideal for trace detection of a host of biological and chemical analytes, such as DNA, protein, bacteria, virus, toxic industrial materials, biological, and/or chemical warfare agents, explosives, radionuclides, and greenhouse gases, among others. We welcome contributions of original research or comprehensive reviews that illustrate the diversity and importance of this exciting area of research.

Prof. Dr. Stephen Holler
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

  • Resonators
  • Cavity
  • Micro-optics
  • Photonics and resonance spectroscopy
  • Temperature and single molecule detection
  • Stress/strain

Published Papers (6 papers)

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10 pages, 2171 KiB  
Article
Optical Thickness Monitoring as a Strategic Element for the Development of SPR Sensing Applications
by Donato Luna-Moreno, Araceli Sánchez-Álvarez and Melissa Rodríguez-Delgado
Sensors 2020, 20(7), 1807; https://doi.org/10.3390/s20071807 - 25 Mar 2020
Cited by 7 | Viewed by 2272
Abstract
The importance of the monitoring of thickness and rate deposition is indispensable for the fabrication of thin film sensors, such as SPR sensors. The sensitivity of SPR responses varies with the thickness of the film, as well as the linear range. Thus, in [...] Read more.
The importance of the monitoring of thickness and rate deposition is indispensable for the fabrication of thin film sensors, such as SPR sensors. The sensitivity of SPR responses varies with the thickness of the film, as well as the linear range. Thus, in the present work, we presented an experimental study of the plasmonic response of Cr/Au thin films deposited onto glass slides by evaporation, based on both a rotation and no-rotation system. The results show that the thickness of the gold film varies from 240 to 620 Å, depending on the glass slide position. The SPR response curves obtained experimentally were compared with simulated plasmonic responses and different parameters such as resonance angle, and the depth, slope and half-width of the SPR curve were analysed. Full article
(This article belongs to the Special Issue Optical–Resonant Microsensors)
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13 pages, 4821 KiB  
Article
Near-Infrared Tunable Laser Absorption Spectroscopic Acetylene Sensor System Using a Novel Three Mirror-Based, Dense Pattern Gas Cell
by Guoqiang Zhong, Zhuo Ma, Junbo Wang, Chuantao Zheng, Yu Zhang, Yiding Wang and Frank K. Tittel
Sensors 2020, 20(5), 1266; https://doi.org/10.3390/s20051266 - 26 Feb 2020
Cited by 12 | Viewed by 2852
Abstract
By contrast with the widely reported traditional two mirror-based Herriott cell, a three mirror-based dense pattern gas cell was proposed, of which the modeling and design were proven to be effective through a comparison between the simulated spot pattern and effective path length [...] Read more.
By contrast with the widely reported traditional two mirror-based Herriott cell, a three mirror-based dense pattern gas cell was proposed, of which the modeling and design were proven to be effective through a comparison between the simulated spot pattern and effective path length and those of the experimental results. A mechanical structure was designed to adjust the position/angle of the three mirrors for aligning the optical path. The experimentally measured reflection number was 60, resulting in an optical path length of ~11 m, which agrees well with the theoretical value of 10.95 m. Combined with a near-infrared laser with a center wavenumber located at an acetylene (C2H2) absorption line of 6521.2 cm−1, a C2H2 sensor system was established to verify the feasibility of the three mirror-based gas cell. Assisted by a data acquisition (DAQ) card, a LabVIEW platform was developed to generate the drive signal of the laser and acquire the second harmonic (2f) signal from the output of the detector. Through Allan variance analysis, the limit of detection (LoD) of the sensor system is 4.36 ppm at an average time of 0.5 s; as the average time exceeds 10 s, the LoD is <1 ppm. The proposed model and design of the three mirror-based gas cell can be used to realize similar gas cells with different absorption path lengths for gas detection based on infrared absorption spectroscopy. Full article
(This article belongs to the Special Issue Optical–Resonant Microsensors)
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16 pages, 3157 KiB  
Article
Multi-Parameter Sensing in a Multimode Self-Interference Micro-Ring Resonator by Machine Learning
by Dong Hu, Chang-ling Zou, Hongliang Ren, Jin Lu, Zichun Le, Yali Qin, Shunqin Guo, Chunhua Dong and Weisheng Hu
Sensors 2020, 20(3), 709; https://doi.org/10.3390/s20030709 - 28 Jan 2020
Cited by 24 | Viewed by 5126
Abstract
A universal multi-parameter sensing scheme based on a self-interference micro-ring resonator (SIMRR) is proposed. Benefit from the special intensity sensing mechanism, the SIMRR allows multimode sensing in a wide range of wavelengths but immune from frequency noise. To process the multiple mode spectra [...] Read more.
A universal multi-parameter sensing scheme based on a self-interference micro-ring resonator (SIMRR) is proposed. Benefit from the special intensity sensing mechanism, the SIMRR allows multimode sensing in a wide range of wavelengths but immune from frequency noise. To process the multiple mode spectra that are dependent on multiple parameters, we adopt the machine learning algorithm instead of massive asymptotic solutions of resonators. Employing the proposed multi-mode sensing approach, a two-parameter SIMRR sensor is designed. Assuming that two gases have different wavelength dependence of refractive indices, the feasibility and effectiveness of the two-parameter sensing strategy are verified numerically. Moreover, the dependence of parameter estimation accuracy on the laser intensity noises is also investigated. The numerical results indicate that our scheme of multi-parameter sensing in a multimode SIMRR holds great potential for practical high-sensitive sensing platforms compared with the single-mode sensing based on whispering gallery mode (WGM) resonators. Full article
(This article belongs to the Special Issue Optical–Resonant Microsensors)
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12 pages, 3548 KiB  
Article
Compact Inner-Wall Grating Slot Microring Resonator for Label-Free Sensing
by Hongjun Gu, He Gong, Chunxue Wang, Xiaoqiang Sun, Xibin Wang, Yunji Yi, Changming Chen, Fei Wang and Daming Zhang
Sensors 2019, 19(22), 5038; https://doi.org/10.3390/s19225038 - 19 Nov 2019
Cited by 11 | Viewed by 3345
Abstract
In this paper, we present and analyze a compact inner-wall grating slot microring resonator (IG-SMRR) with the footprint of less than 13 μm × 13 μm on the silicon-on-insulator (SOI) platform for label-free sensing, which comprises a slot microring resonator (SMRR) and inner-wall [...] Read more.
In this paper, we present and analyze a compact inner-wall grating slot microring resonator (IG-SMRR) with the footprint of less than 13 μm × 13 μm on the silicon-on-insulator (SOI) platform for label-free sensing, which comprises a slot microring resonator (SMRR) and inner-wall grating (IG). Its detection range is significantly enhanced without the limitation of the free spectral region (FSR) owing to the combination of SMRR and IG. The IG-SMRR has an ultra-large quasi-FSR of 84.5 nm as the detection range, and enlarged factor is up to over 3 compared with the conventional SMRR. The concentration sensitivities of sodium chloride solutions and D-glucose solutions are 996.91 pm/% and 968.05 pm/%, respectively, and the corresponding refractive index (RI) sensitivities are 559.5 nm/RIU (refractive index unit) and 558.3 nm/RIU, respectively. The investigation on the combination of SMRR and IG is a valuable exploration of label-free sensing application for ultra-large detection range and ultra-high sensitivity in future. Full article
(This article belongs to the Special Issue Optical–Resonant Microsensors)
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10 pages, 2591 KiB  
Article
Fano Resonance in a MIM Waveguide with Two Triangle Stubs Coupled with a Split-Ring Nanocavity for Sensing Application
by Xiaoyu Yang, Ertian Hua, Mengmeng Wang, Yifei Wang, Feng Wen and Shubin Yan
Sensors 2019, 19(22), 4972; https://doi.org/10.3390/s19224972 - 15 Nov 2019
Cited by 29 | Viewed by 2322
Abstract
Herein, a compact refractive index nanosensor comprising a metal- insulator- metal (MIM) waveguide with symmetric two triangle stubs coupled with a circular split-ring resonance cavity (CSRRC) is theoretically presented. An analysis of the propagation characteristics of the designed structure is discussed employing the [...] Read more.
Herein, a compact refractive index nanosensor comprising a metal- insulator- metal (MIM) waveguide with symmetric two triangle stubs coupled with a circular split-ring resonance cavity (CSRRC) is theoretically presented. An analysis of the propagation characteristics of the designed structure is discussed employing the finite element method (FEM). The calculation results revealed that a Fano resonance outline emerged, which results from an interaction between the continuous broadband state of the waveguide with two symmetric triangle stubs and the discrete narrowband state of the CSRRC. The influence of geometric parameters on sensing properties was studied in detail. The maximum sensitivity reached 1500 nm/RIU with a high figure of merit of 65.2. The presented structure has great applications for on-chip plasmonic nanosensors. Full article
(This article belongs to the Special Issue Optical–Resonant Microsensors)
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11 pages, 2372 KiB  
Letter
Hydrogen Sensor: Detecting Far-Field Scattering of Nano-Blocks (Mg, Ag, and Pd)
by Eunso Shin, Young Jin Lee, Hyoungjoo Nam and Soon-Hong Kwon
Sensors 2020, 20(14), 3831; https://doi.org/10.3390/s20143831 - 09 Jul 2020
Cited by 2 | Viewed by 2074
Abstract
Hydrogen sensor technologies have been rapidly developing. For effective and safe sensing, we proposed a hydrogen sensor composed of magnesium (Mg), silver (Ag), and palladium (Pd) nano-blocks that overcomes the spectral resolution limit. This sensor exploited the properties of Mg and Pd when [...] Read more.
Hydrogen sensor technologies have been rapidly developing. For effective and safe sensing, we proposed a hydrogen sensor composed of magnesium (Mg), silver (Ag), and palladium (Pd) nano-blocks that overcomes the spectral resolution limit. This sensor exploited the properties of Mg and Pd when absorbing hydrogen. Mg became a dielectric material, and the atomic lattice of Pd expanded. These properties led to changes in the plasmonic gap mode between the nano-blocks. Owing to the changing gap mode, the far-field scattering pattern significantly changed with the hydrogen concentration. Thus, sensing the hydrogen concentration was able to be achieved simply by detecting the far-field intensity at a certain angle for incident light with a specific wavelength. Full article
(This article belongs to the Special Issue Optical–Resonant Microsensors)
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