Results 51 to 60 of about 818,741 (308)
Optical forces in the T-matrix formalism
Optical tweezers are a crucial tool for the manipulation and characterisation, without mechanical contact, of micro- and nanoparticles, ranging from biological components, such as biomolecules, viruses, bacteria, and cells, to nanotubes, nanowires, layered materials, plasmonic nanoparticles, and their composites.
Polimeno P.+4 more
openaire +4 more sources
Three-dimensional Doppler, polarization-gradient, and magneto-optical forces for atoms and molecules with dark states [PDF]
We theoretically investigate the damping and trapping forces in a three-dimensional magneto-optical trap (MOT), by numerically solving the optical Bloch equations. We focus on the case where there are dark states because the atom is driven on a ”type-II"
Devlin, J, Tarbutt, M
core +4 more sources
Trapping and Manipulation of Single Cells in Crowded Environments
Optical tweezers provide a powerful tool to trap and manipulate living cells, which is expected to help people gain physiological insights at single-cell level.
Qian Zhao+8 more
doaj +1 more source
An all-optical trap for a gram-scale mirror [PDF]
We report on a stable optical trap suitable for a macroscopic mirror, wherein the dynamics of the mirror are fully dominated by radiation pressure. The technique employs two frequency-offset laser fields to simultaneously create a stiff optical restoring
Chen, Y.+9 more
core +2 more sources
Trapping and Optomechanical Sensing of Particles with a Nanobeam Photonic Crystal Cavity
Particle trapping and sensing serve as important tools for non-invasive studies of individual molecule or cell in bio-photonics. For such applications, it is required that the optical power to trap and detect particles is as low as possible, since large ...
Lin Ren, Yunpeng Li, Na Li, Chao Chen
doaj +1 more source
Multi-electron beam generation using co-propagating, parallel laser beams
High intensity short pulse laser plasma interaction experiments were performed to investigate laser wakefield acceleration (LWFA) in the ‘bubble’ regime. Using a specially designed phase plate, two high intensity laser focal spots were generated adjacent
J Elle+9 more
doaj +1 more source
MSUD-YOLO: A Novel Multiscale Small Object Detection Model for UAV Aerial Images
Due to the objects in UAV aerial images often presenting characteristics of multiple scales, small objects, complex backgrounds, etc., the performance of object detection using current models is not satisfactory.
Xiaofeng Zhao+6 more
doaj +1 more source
Zeptonewton force sensing with nanospheres in an optical lattice [PDF]
Optically trapped nanospheres in high-vaccum experience little friction and hence are promising for ultra-sensitive force detection. Here we demonstrate measurement times exceeding $10^5$ seconds and zeptonewton force sensitivity with laser-cooled silica
Casey, Kirsten+3 more
core +3 more sources
Optical tweezers escape forces [PDF]
With suitable calibration, optical tweezers can be used to measure forces. If the maximum force that can be exerted is of interest, calibration can be performed using viscous drag to remove a particle from the trap, typically by moving the stage. The stage velocity required to remove the particle then gives the escape force.
Bui, Ann AM+5 more
openaire +3 more sources
Optical forces in coupled chiral particles [PDF]
11 pages, 13 ...
Kah Jen Wo+5 more
openaire +5 more sources