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This experiment uses digital interferometry to reduce polarisation noise from a fiber interferometer to the level of double Rayleigh backscatter making precision fiber metrology systems robust for remote field applications. This is achieved with a measurement of the Jones matrix with interferometric sensitivity in real time, limited only by fibre length and processing bandwidth. This new approach leads to potentially new metrology applications and the ability to do ellipsometry without polarisation elements in the output field.
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http://dx.doi.org/10.1364/OE.24.010486 | DOI Listing |
Sci Adv
September 2025
Division of Nanomaterials and Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026 China.
Optical-enabled identification and interaction provide an integral link between the digital and physical realms. However, nowadays optic-encodings, predominantly reliant on light's intensity and wavelength, are hindered by environmental light interference and limited information capacity. The introduction of unusual polarization states, such as circular polarization-which is absent from ordinary surroundings-holds promise for higher-dimensional interaction.
View Article and Find Full Text PDFJ Acoust Soc Am
September 2025
Centre National de la Recherche Scientifique, Centre de Recherche en Automatique de Nancy, Université de Lorraine, Nancy, F-54000, France.
Acoustic particle motion is the primary cue for fish hearing and a vector quantity that contains polarization information (including directionality) relevant to the directional hearing abilities of fishes. Polarization metrics, including ellipse orientation angle, ellipticity angle, and degree of polarization, have been recently applied to describe particle motion polarization in physical acoustical oceanography studies and have yet to be applied to in situ biological signals. This study harnessed data from a compact orthogonal hydrophone array deployed on the seafloor offshore of Florida (part of the Atlantic Deepwater Ecosystem Observatory Network) to investigate particle motion polarization properties of unidentified acoustic fish signals relative to ambient and ship noise.
View Article and Find Full Text PDFIntegr Org Biol
August 2025
Department of Biological Sciences, University of South Carolina, 715 Sumter Street, Columbia, SC 29208, USA.
Gaze stabilization is important to animals because it allows them to visually differentiate between their own motion relative to their environment and the motion of objects within their environment. Animals can struggle to stabilize their gaze in environments that have a high amount of visual noise. In shallow aquatic environments, such as tidal creeks, the motion of the water's surface can create dynamic spatiotemporal fluctuations in illumination referred to as "caustic flicker.
View Article and Find Full Text PDFNanophotonics
August 2025
National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, C ollaborative Innovation Center of Advanced Microstructures, Nanjing University
Frequency modulated continuous wave (FMCW) light detection and ranging (LiDAR) has recently become a research hotspot in the fields of autonomous driving and intelligent perception due to its high-precision ranging and velocity measurement capabilities. However, the existing LiDAR systems are usually challenged in expanding the field-of-view (FOV), which often comes at the expense of beam quality and degrades the detection accuracy and signal-to-noise ratio. On the other hand, the complexity of data processing algorithms may introduce significant measurement inaccuracies, potentially leading to substantial deviations in the final results.
View Article and Find Full Text PDFBrain Res Bull
August 2025
Department of Rehabilitation Medicine, Nanfang Hospital, Southern Medical University, PR China; Institute of Brain Diseases, Nanfang Hospital, Southern Medical University, PR China. Electronic address:
Perioperative neurocognitive disorders (PND), encompassing cognitive impairments linked to anesthesia and surgery, significantly impact elderly patients and increase postoperative risks. Intermittent theta burst stimulation (iTBS), a non-invasive neuromodulation protocol, has shown cognitive-enhancing potential in clinical studies. However, its utility for preventing PND remains unexplored.
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