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Longitudinal Multi-Channel Focused Vortex and Vector Beams Generation by Quarter-Wave Plate Meta-Atom Metasurfaces.
Nanomaterials (Basel)
February 2025
Department of Physics, Changzhi University, Changzhi 046011, China.
Metasurface-based longitudinal modulation introduces the propagation distance as a new degree of freedom, extending the light modulation with metasurfaces from 2D to 3D space. However, relevant longitudinal studies have been constrained to designing the metasurface of half-wave plate (HWP) meta-atoms and generating either non-focused or two-channel vortex and vector beams. In this study, we propose a metasurface composed of quarter-wave plate (QWP) meta-atoms to generate the longitudinal multi-channel focused vortex and vector beams.
View Article and Find Full Text PDFOptical coherence tomography needle probe for real-time visualization of temperature-induced phase changes within subcutaneous fatty tissue.
J Biomed Opt
March 2025
Universität zu Lübeck, Institute of Biomedical Optics, Lübeck, Germany.
: Selective cryolipolysis is a widely used aesthetic procedure that cools subcutaneous adipose tissue to temperatures as low as to induce fat cell destruction. However, real-time monitoring techniques are lacking, limiting the ability to optimize safety and efficacy. Traditional imaging methods either fail to provide adequate penetration depth or lack the resolution necessary for visualizing subcutaneous fatty tissue dynamics.
View Article and Find Full Text PDFDual wavelength Brillouin laser terahertz source stabilized to carbonyl sulfide rotational transition.
Nat Commun
March 2025
Boulder Research Labs, IMRA America, Inc., 1551 S Sunset St. Suite C, Longmont, CO, USA.
Optical-based terahertz sources are important for many burgeoning scientific and technological applications. Among such applications is precision spectroscopy of molecules, which exhibit rotational transitions at terahertz frequencies. Stemming from precision spectroscopy is frequency discrimination (a core technology in atomic clocks) and stabilization of terahertz sources.
View Article and Find Full Text PDFSub-minute synthesis and modulation of β/λ-MTiO ceramics towards accessible heat storage.
Nat Commun
March 2025
School of Materials Science and Engineering, Shanghai University, Shanghai, China.
Nearly 50% of global primary energy consumption is lost as low-temperature heat. λ-TiO holds promise for waste heat harvesting and reuse; however, achieving reversible phase transitions between its λ and β phases under accessible conditions remains a major challenge. Here, we proposed a simple laser method that incorporates element substitution for sub-minute synthesis (20-60 s) of λ-MTiO (M = Mg, Al, Sc, V, Cr, Mn, or Fe, 0.
View Article and Find Full Text PDFExperimental and computational insights into the electronic structures and absorption-emission characteristics of coumarin, C-6H, C-153, and C-343 dyes.
Spectrochim Acta A Mol Biomol Spectrosc
March 2025
Department of Physics, Faculty of Engineering and Natural Sciences, Manisa Celal Bayar University, TR-145140 Manisa, Turkey.
This paper explores the electronic structure and spectral characteristics of coumarin (C), C-6H, C-153, and C-343 in the protic polar solvent acetonitrile, combining computational methods via Density Functional Theory (DFT) and time-dependent Density Functional Theory (TD-DFT) with experimental analysis of UV-Vis and fluorescence spectra. The optoelectronic features of C, C-6H, C-153, and C-343 are primarily utilized in the solution phase for various applications, such as lasers and dye-sensitized solar cells. Computational studies were conducted using four different Modal Chemistry methods [MC1: CAM-B3LYP/6-311++G(d.
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