Results 51 to 60 of about 818,741 (308)

Optical forces in the T-matrix formalism

open access: yesAtti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali, 2019
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]

open access: yes, 2016
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

open access: yesFrontiers in Bioengineering and Biotechnology, 2020
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]

open access: yes, 2007
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

open access: yesCrystals, 2019
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

open access: yesNew Journal of Physics, 2018
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

open access: yesDrones
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]

open access: yes, 2016
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]

open access: yesSPIE Proceedings, 2014
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]

open access: yesPhysical Review A, 2020
11 pages, 13 ...
Kah Jen Wo   +5 more
openaire   +5 more sources

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