Advancements in Optical Measurements and Sensing Technology

A special issue of AppliedPhys (ISSN 3042-6553).

Deadline for manuscript submissions: 10 July 2026 | Viewed by 996

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Department of Mechanical Engineering, College of Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan
Interests: scattering; optical coherence tomography; brain imaging; neuroscience; optics in biology; optics in environmental assessments; near-field optics; applied linguistics
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Special Issue Information

Dear Colleagues,

This Special Issue invites articles from a vast range of topics that utilize optical measurements and sensing technology in different environments, from biological to underwater settings. Optical measurements and technology both involve the usage of fundamental properties, such as diffraction, absorption, transmission, and scattering. This Special Issue welcomes both review papers and original contributions related to an array of research fields. The topics of interest include, but are not restricted to, the following:

  • Imaging;
  • Spectrometry;
  • Optical interferometric techniques;
  • Nano-optics;
  • Fiber optics;
  • Biomedical optics;
  • Photoacoustics;
  • Ultrasound in sensing;
  • Hydrophones;
  • Fiberoptic hydrophones;
  • Ultrasonic actuators;
  • Ultrasonic cleaning;
  • Ultrasonic fabrication and imaging;
  • Sensors and sensor technologies.

Prof. Dr. Uma Maheswari Rajagopalan
Guest Editor

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Keywords

  • imaging
  • spectrometry
  • optical interferometric techniques
  • nano-optics
  • fiber optics
  • biomedical optics
  • photoacoustics
  • ultrasound in sensing
  • hydrophones
  • fiberoptic hydrophones
  • ultrasonic actuators
  • ultrasonic cleaning
  • ultrasonic fabrication and imaging
  • image processing related algorithm

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Published Papers (1 paper)

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Research

14 pages, 2669 KB  
Article
Laser Biospeckles Analysis for Rapid Evaluation of Organic Pollutants in Water
by Arti Devi, Hirofumi Kadono and Uma Maheswari Rajagopalan
AppliedPhys 2026, 2(1), 1; https://doi.org/10.3390/appliedphys2010001 - 21 Dec 2025
Viewed by 511
Abstract
Rapid evaluation of water toxicity requires biological methods capable of detecting sub-lethal physiological changes without depending on chemical identification. Conventional microscopy-based bioassays are limited by low throughput and difficulties in observing small, transparent and fast-moving microorganisms. This study applies a laser-biospeckle, non-imaging microbioassay [...] Read more.
Rapid evaluation of water toxicity requires biological methods capable of detecting sub-lethal physiological changes without depending on chemical identification. Conventional microscopy-based bioassays are limited by low throughput and difficulties in observing small, transparent and fast-moving microorganisms. This study applies a laser-biospeckle, non-imaging microbioassay to assess the motility responses of Paramecium caudatum and Euglena gracilis exposed to two organic pollutants, trichloroacetic acid (TCAA) and acephate. Dynamic speckle patterns were recorded using a 638 nm laser diode (Thorlabs Inc., Tokyo, Japan) and a CCD camera (Gazo Co., Ltd., Tokyo, Japan) at 60 fps for 120 s. Correlation time, derived from temporal cross-correlation analysis, served as a quantitative indicator of motility. Exposure to TCAA (0.1–50 mg/L) produced strong concentration-dependent inhibition, with correlation time increasing up to 16-fold at 500× PL in P. caudatum (p < 0.01), whereas E. gracilis showed a delayed response, with significant inhibition only above 250× PL. In contrast, acephate exposure (0.036–3.6 mg/L) induced motility enhancement in both species, reflected by decreases in correlation time of up to 57% in P. caudatum and 40% in E. gracilis at 100× PL. Acute trends diminished after 24–48 h, indicating time-dependent physiological adaptation. These results demonstrate that biospeckled-derived correlation time sensitively captures both inhibitory and stimulatory behavioral responses, enabling real-time, high-throughput water toxicity screening without microscopic imaging. The method shows strong potential for integration into automated water-quality monitoring systems. Full article
(This article belongs to the Special Issue Advancements in Optical Measurements and Sensing Technology)
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