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Subcycle modulation of light's orbital angular momentum via a Fourier space-time transformation.
Sci Adv
January 2025
Center for Nano Science and Technology, Fondazione Istituto Italiano di Tecnologia, Milano, Italy.
Achieving highly tailored control over both the spatial and temporal evolution of light's orbital angular momentum (OAM) on ultrafast timescales remains a critical challenge in photonics. Here, we introduce a method to modulate the OAM of light on a femtosecond scale by engineering a space-time coupling in ultrashort pulses. By linking azimuthal position with time, we implement an azimuthally varying Fourier transformation to dynamically alter light's spatial distribution in a fixed transverse plane.
View Article and Find Full Text PDFHighly Photoreactive Semiconducting Polymers with Cascade Intramolecular Singlet Oxygen and Energy Transfer for Cancer-Specific Afterglow Theranostics.
J Am Chem Soc
January 2025
School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457, Singapore.
Afterglow luminescence provides ultrasensitive optical detection by minimizing tissue autofluorescence and increasing the signal-to-noise ratio. However, due to the lack of suitable unimolecular afterglow scaffolds, current afterglow agents are nanocomposites containing multiple components with limited afterglow performance and have rarely been applied for cancer theranostics. Herein, we report the synthesis of a series of oxathiine-containing donor-acceptor block semiconducting polymers (PDCDs) and the observation of their high photoreactivity and strong near-infrared (NIR) afterglow luminescence.
View Article and Find Full Text PDFDynamically Assembling Magnetic Nanochains as New Generation of Swarm-Type Magneto-Mechanical Nanorobots Affecting Biofilm Integrity.
Adv Healthc Mater
January 2025
Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, Université Toulouse III - Paul Sabatier (UPS), 205 Route de Narbonne, Toulouse, 31400, France.
Article Synopsis
- Bacterial resistance is increasing, necessitating innovative strategies for effective antibiotic treatment.
- Ultra-short propelling magnetic nanochains, designed to mimic natural bacterial movement, enhance the efficacy of antibiotics against biofilm-forming Staphylococcus epidermidis by converting resistant bacteria into sensitive ones.
- These nanochains, activated by a low-intensity rotating magnetic field, operate by mechanically disrupting bacterial structures and working synergistically with antibiotics to completely eliminate biofilms.
Non-Resonant Magnetic X-ray Scattering as a Probe of Ultrafast Molecular Spin-State Dynamics: An Ab Initio Theory.
J Chem Theory Comput
January 2025
State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China.
Article Synopsis
- Advanced techniques like high harmonic generation and X-ray free-electron lasers have enabled the study of ultrafast electron and spin dynamics on extremely short timescales.
- The authors propose using magnetic X-ray scattering (MXS) to measure molecular spin-state dynamics and outline a protocol for simulating MXS patterns using multiconfigurational quantum chemistry.
- The method is validated through simulations of spin-flip dynamics in the TiCl molecule, showcasing MXS's ability to detect real-time spin-state changes and infer spatial characteristics of spin density from diffraction patterns.
Tunable Multisoliton State Ultrafast Fiber Laser Based on NiSe and Generation of Vector Dual-Wavelength Solitons.
ACS Appl Mater Interfaces
January 2025
College of Optical, Mechanical and Electrical Engineering, Zhejiang A&F University, Lin'an 311300, China.
As a member of the chalcogenide family, NiSe exhibits a direct bandgap of 1.74 eV, making it a promising candidate for nonlinear optical devices. However, its potential in the near-infrared region of the telecommunication band has not been fully explored.
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