We describe the experimental realization of a dynamical optical trap for atoms: the Rotating Off-resonant Dipole Optical (RODiO) Trap. A blue detuned circularly scanned laser beam creates a time averaged ;;box" for the atoms. We characterized this novel confinement technique by varying the trapping geometry and the laser beam parameters. Our observations agree well with a numerical model.
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http://dx.doi.org/10.1364/oe.8.000159 | DOI Listing |
Nanomaterials (Basel)
February 2025
Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei 184-8588, Tokyo, Japan.
We report on the formation of homogeneous nanostructures using a two-step ablation process with square flattop beams of femtosecond (fs) laser pulses. The Gaussian beam output from a ytterbium fs laser system was converted to a square flattop beam by a refractive beam shaper and a square mask. This beam was split into two with a diffraction optical element, and then the downsized beams were spatially and temporally superimposed on a titanium surface.
View Article and Find Full Text PDFNanomaterials (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 PDFPhotoacoustics
April 2025
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, PR China.
A ppb-level sulfur dioxide (SO) monitoring platform was developed by exploiting standard photoacoustic spectroscopy and a novel, highly stable UV laser. A 266.22 nm LD-pumped solid-state, acousto-optic modulator Q-switched laser with high beam quality (M =1.
View Article and Find Full Text PDFJ Clin Gastroenterol
March 2025
Department of Ultrasound Medicine, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
Goals: To assess the feasibility and safety of endoscopic ultrasound-guided laser ablation (EUS-LA) of retroperitoneal lymph node (RPLN) metastasis.
Background: RPLN metastasis is challenging to treat, partly due to hazardous location. EUS-LA is a new attractive option for lesions in high-risk or percutaneous difficult-to-reach locations.
J Phys Chem Lett
March 2025
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
The ability to dynamically manipulate the optoelectronic and magnetic properties in functional materials under nonequilibrium conditions is essential for the advancement of quantum technologies and energy-related applications. Here, we demonstrate a novel method to regulate the optoelectronic and magnetic properties of YCoO, a representative perovskite oxide, using ultrafast vortex laser pulses coupled with nonlinear phonon interactions. Vortex light, characterized by its helical phase front and topological charge, allows selective excitation of infrared phonon modes, enabling anisotropic lattice distortions and precise modulation of material properties.
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