Optical Technology for Challenging Conditions:Methods and Applications

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "New Applications Enabled by Photonics Technologies and Systems".

Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 3014

Special Issue Editors

School of Marine Science and Technology, Tianjin University, Tianjin 300072, China
Interests: optical imaging; polarimetry; ocean optics
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Guest Editor
College of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
Interests: optical imaging; optical scattering; photodetectors; optoelectronic imaging; computational imaging; machine vision

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Guest Editor
Department of Precision Instruments, Tsinghua University, Beijing 100084, China
Interests: near-field photometry; polarimetric imaging
College of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
Interests: optical imaging; optical scattering; photodetectors

Special Issue Information

Dear Colleagues,

With the ongoing advancements in manufacturing technology and information processing technology, advanced optical imaging/measurement techniques play irreplaceable roles in many fields, such as the biomedical field, neurophotonics, intelligent driving, aerospace exploration, and remote sensing. However, these applications often face complex challenges in terms of application scenarios and environments, such as non-uniform lighting, strong scattering, low light, high noise, and turbulence. Solving the challenges of optical signal attenuation, oscillation, and distortion in complex environments/scenarios is crucial to improving the quality of optical imaging and detection in the aforementioned fields. Consequently, there is a pressing need for the development of cutting-edge optical imaging and detecting systems, coupled with intelligent processing algorithms, to expand the applicability of optical technology in complex environments and bolster its technical resilience.

The purpose of this Special Issue is to provide a platform for researchers to share and discuss their important discoveries, theoretical and experimental advances, technical breakthroughs, methodological innovations, application developments, viewpoints, and perspectives to the community of optical imaging/measurement. All theoretical, numerical, and experimental works related to optical techniques used in complex conditions are accepted. Topics include, but are not limited to, the following:

  • Optics in complex media (scattering tissues, turbid water, cloud, fog, etc.);
  • Imaging in adverse weather conditions;
  • Photometry and lighting technology;
  • Optical remote sensing;
  • Optical super-resolution, dehazing, denoising/despeckling, and deblurring;
  • Target detection in challenging conditions.

Dr. Xiaobo Li
Dr. Jing Wu
Dr. Hongyuan Wang
Dr. Yu Liu
Guest Editors

Manuscript Submission Information

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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 2400 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 imaging
  • complex media
  • adverse weather conditions
  • wavefront shaping

Published Papers (3 papers)

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Research

9 pages, 2039 KiB  
Article
Modulated Short-Time Fourier-Transform-Based Nonstationary Signal Decomposition for Dual-Comb Ranging Systems
by Ningning Han, Chao Wang, Zhiyang Wu, Xiaoyu Zhai, Yongzhen Pei, Haonan Shi and Xiaobo Li
Photonics 2024, 11(6), 560; https://doi.org/10.3390/photonics11060560 - 14 Jun 2024
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Abstract
Analyzing and breaking down nonstationary signals into their primary components is significant in various optical applications. In this work, we design a direct, localized, and mathematically rigorous method for nonstationary signals by employing a modulated short-time Fourier transform (MSTFT) that can be implemented [...] Read more.
Analyzing and breaking down nonstationary signals into their primary components is significant in various optical applications. In this work, we design a direct, localized, and mathematically rigorous method for nonstationary signals by employing a modulated short-time Fourier transform (MSTFT) that can be implemented efficiently using fast Fourier transform, subsequently isolating energy-concentrated sets through an approximate threshold process, allowing us to directly retrieve instantaneous frequencies and signal components by determining the maximum frequency within each set. MSTFT provides a new insight into the time-frequency analysis in multicomponent signal separation and can be extended to other time-frequency transforms. Beyond the analysis of the synthetic, we also perform real dual-comb ranging signals under turbid water, and the results show an approximate 1.5 dB improvement in peak signal-to-noise ratio, further demonstrating the effectiveness of our method in challenging conditions. Full article
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16 pages, 3586 KiB  
Article
Planar Bilayer PT-Symmetric Systems and Resonance Energy Transfer
by Aliaksandr Arlouski and Andrey Novitsky
Photonics 2024, 11(2), 169; https://doi.org/10.3390/photonics11020169 - 10 Feb 2024
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Abstract
Parity-time (PT) symmetry provides an outstanding improvement of photonic devices’ performance due to the remarkable physics behind it. Resonance energy transfer (RET) as an important characteristic mediating the molecules that can be tailored in the PT-symmetric environment, too. We study how planar bilayer [...] Read more.
Parity-time (PT) symmetry provides an outstanding improvement of photonic devices’ performance due to the remarkable physics behind it. Resonance energy transfer (RET) as an important characteristic mediating the molecules that can be tailored in the PT-symmetric environment, too. We study how planar bilayer PT-symmetric systems affect the process of resonance energy transfer occurring in the vicinity thereof. First, we investigate the reflectance and transmittance spectra of such systems by calculating reflection and transmission coefficients as well as total radiation amplification as functions of medium parameters. We obtain that reflectance and total amplification are greatest near the exceptional points of the PT-symmetric system. Then, we perform numerical calculations of the RET rate and investigate its dependence on the complex permittivity of the PT-symmetric medium, dipole orientation, frequency of radiation and layer thickness. Optically thick PT-symmetric systems may operate at lower gain at the expense of the appearance of chaotic-like behaviors. These appear owing to the dense oscillations in the reflectance and transmittance spectra and vividly manifest themselves as stochastic-like positions of the exceptional points for PT-symmetric bilayers. The RET rate, being a result of the field interference, can be significantly amplified and suppressed near exceptional points exhibiting a Fano-like lineshape. Full article
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15 pages, 6967 KiB  
Article
Polarization-Based De-Scattering Imaging in Turbid Tissue-like Scattering Media
by Shirong Zhang, Jian Liang, Yanru Jiang and Liyong Ren
Photonics 2023, 10(12), 1374; https://doi.org/10.3390/photonics10121374 - 14 Dec 2023
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Abstract
In shallow tissues of the human body, pathological changes often occur, and there are several kinds of scattering media, such as mucosa, fat, and blood, present on the surface of these tissues. In such scattering environments, it is difficult to distinguish the location [...] Read more.
In shallow tissues of the human body, pathological changes often occur, and there are several kinds of scattering media, such as mucosa, fat, and blood, present on the surface of these tissues. In such scattering environments, it is difficult to distinguish the location of the lesions using traditional attenuation-based imaging methods, while polarization-based imaging methods are more sensitive to this information. Therefore, in this paper, we conducted experiments using diluted milk to simulate biological tissues with scattering effects, illuminated with non-polarized light sources, and used an optimized robust polarization de-scattering algorithm for image processing. The results were qualitatively and quantitatively analyzed through local intensity comparison and visual fidelity functions, verifying the effectiveness of this algorithm under specific conditions. Full article
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