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Linear and nonlinear record high optical birefringence in anisotropic van der Waals crystals.
Light Sci Appl
January 2025
Chair in Hybrid Nanosystems, Faculty of Physics, Ludwig-Maximilians-Universität München, 80539, Munich, Germany.
Multilayered van der Waals (vdW) materials are semiconductors composed of atomically thin crystal layers, held together by weak vdW forces. They offer unique crystal structures and electronic properties, distinct from conventional semiconductors, making them a promising platform for linear and nonlinear optics. In this context, the large refractive indexes given by highly polarizable transition metals, combined with excitonic resonances and unconventional crystalline structures, provides a toolbox for exploring non-linear physics and strong light-matter interactions with unprecedented opportunities for nanoscale optics.
View Article and Find Full Text PDFPortable astronomical observation system based on large-aperture concentric-ring metalens.
Light Sci Appl
January 2025
Institute of Microstructure Technology (IMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtzplatz 1, Eggenstein-Leopoldshafen, 76344, Germany.
The core advantage of metalenses over traditional bulky lenses lies in their thin volume and lightweight. Nevertheless, as the application scenarios of metalenses extend to the macro-scale optical imaging field, a contradiction arises between the increasing demand for large-aperture metalenses and the synchronous rise in design and processing costs. In response to the application requirements of metalens with diameter reaching the order of 10λ or even 10λ, this paper proposes a novel design method for fixed-height concentric-ring metalenses, wherein, under the constraints of the processing technology, a subwavelength 2D building unit library is constructed based on different topological structures, and the overall cross-section of the metalens is assembled.
View Article and Find Full Text PDFNear-infrared fluorescence imaging platform with ultra large Stokes shift for monitoring and bioimaging of hydrogen peroxide in the process of ferroptosis.
Spectrochim Acta A Mol Biomol Spectrosc
December 2024
Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Shandong Provincial Key Laboratory of Biochemical Engineering, Qingdao Nucleic Acid Rapid Detection Engineering Research Center, College of Biological Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
Hydrogen peroxide (HO), as a strong oxidant, is crucial for the aerobic metabolism of organisms and is intricately linked to the onset of numerous diseases. Real-time monitor HO levels in the environment and biological microenvironment is of paramount importance for environment protection and elucidating HO-related physiological and pathological processes. In this study, a novel near-infrared fluorescence imaging platform was developed and a near-infrared fluorescent probe FBMH was constructed based on the platform with photoinduced electron transfer mechanism.
View Article and Find Full Text PDFApplication of odor imaging sensor coupled with hyperspectral imaging technology in monitoring the large yellow croaker (Larimichthys crocea) freshness.
Spectrochim Acta A Mol Biomol Spectrosc
December 2024
College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China. Electronic address:
Total volatile base nitrogen (TVB-N) is an important indicator for evaluating the freshness of aquatic products and holds great significance in assessing food safety. Traditional testing methods for TVB-N content use the Kjeldahl method, which has shortcomings like lengthy processes, cumbersome steps, and sample destruction. This study innovatively couples the hyperspectral imaging (HSI) technique with an odor imaging sensor (OIS) to achieve non-destructive prediction of TVB-N content in the large yellow croaker.
View Article and Find Full Text PDFUncovering Astrocyte Morphological Dynamics Using Optical Diffraction Tomography and Shape-Based Trajectory Inference.
Adv Healthc Mater
December 2024
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA.
Astrocytes, integral components of the central nervous system, are increasingly recognized for their multifaceted roles beyond support cells. Despite their acknowledged importance, understanding the intricacies of astrocyte morphological dynamics remains limited. Our study marks the first exploration of astrocytes using optical diffraction tomography (ODT), establishing a label-free, quantitative method to observe morphological changes in astrocytes over a 7-day in-vitro period.
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