Comparison of different techniques in optical trap for generating picokelvin 3D atom cloud in microgravity

2016 ◽  
Vol 359 ◽  
pp. 123-128 ◽  
Author(s):  
Hepeng Yao ◽  
Tian Luan ◽  
Chen Li ◽  
Yin Zhang ◽  
Zhaoyuan Ma ◽  
...  
Keyword(s):  
Optical Trap ◽  
Atom Cloud

Transfer of ultracold 87Rb from a QUIC magnetic trap into a far off resonance optical trap

2007 ◽  
Vol 85 (3) ◽  
pp. 247-258 ◽  
Author(s):  
H Ming ◽  
W A van Wijngaarden
Keyword(s):  
Laser Beam ◽  
Magnetic Trap ◽  
Temporal Evolution ◽  
Optical Trap ◽  
Probe Laser ◽  
Ultracold Atom ◽  
Trapped Atoms ◽  
Atom Cloud ◽  
Optically Trapped

Ultracold 87Rb atoms were transferred from a QUIC (quadrupole and Ioffe configuration) magnetic trap into a far off resonance optical trap (FORT). FORTs were created by focusing a 150 mW laser beam having a wavelength of 852 nm to a spot having a radius of 20 and 30 µm. A probe laser then passed through the ultracold atom cloud after the magnetic trap was turned off to study the temporal evolution of the optically trapped atoms. Nearly 106 atoms could be transferred into the FORT at temperatures as low as 1 µK with an efficiency as high as 50%. PACS No.: 32.80.Pj

scholarly journals Biomechanics of Neutrophil Tethers

Life ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 515
Author(s):  
Andrea Cugno ◽  
Alex Marki ◽  
Klaus Ley
Keyword(s):  
Cell Activation ◽  
Optical Trap ◽  
Biomechanical Properties ◽  
Force Microscopy ◽  
Advantages And Disadvantages ◽  
Atomic Force ◽  
Microfluidic Flow ◽  
Biomembrane Force Probe ◽  
Membrane Reservoir

Leukocytes, including neutrophils, which are propelled by blood flow, can roll on inflamed endothelium using transient bonds between selectins and their ligands, and integrins and their ligands. When such receptor–ligand bonds last long enough, the leukocyte microvilli become extended and eventually form thin, 20 m long tethers. Tether formation can be observed in blood vessels in vivo and in microfluidic flow chambers. Tethers can also be extracted using micropipette aspiration, biomembrane force probe, optical trap, or atomic force microscopy approaches. Here, we review the biomechanical properties of leukocyte tethers as gleaned from such measurements and discuss the advantages and disadvantages of each approach. We also review and discuss viscoelastic models that describe the dependence of tether formation on time, force, rate of loading, and cell activation. We close by emphasizing the need to combine experimental observations with quantitative models and computer simulations to understand how tether formation is affected by membrane tension, membrane reservoir, and interactions of the membrane with the cytoskeleton.

scholarly journals Compact ultracold electron source based on a grating magneto-optical trap

2019 ◽  
Vol 22 (2) ◽  
Author(s):  
J. G. H. Franssen ◽  
T. C. H. de Raadt ◽  
M. A. W. van Ninhuijs ◽  
O. J. Luiten
Keyword(s):  
Optical Trap ◽  
Electron Source ◽  
Magneto Optical Trap

scholarly journals Narrow-line magneto-optical trap for europium

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
Yuki Miyazawa ◽  
Ryotaro Inoue ◽  
Hiroki Matsui ◽  
Kenta Takanashi ◽  
Mikio Kozuma
Keyword(s):  
Optical Trap ◽  
Magneto Optical Trap ◽  
Narrow Line

scholarly journals Enhanced Signal-to-Noise and Fast Calibration of Optical Tweezers Using Single Trapping Events

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 570
Author(s):  
Alexander B. Stilgoe ◽  
Declan J. Armstrong ◽  
Halina Rubinsztein-Dunlop
Keyword(s):  
Brownian Motion ◽  
Optical Tweezers ◽  
Optical Trap ◽  
Force Transducer ◽  
Signal To Noise ◽  
Likelihood Estimator ◽  
Micro Fluidics ◽  
Large Numbers ◽  
Force Reconstruction ◽  
Micron Particle

The trap stiffness us the key property in using optical tweezers as a force transducer. Force reconstruction via maximum-likelihood-estimator analysis (FORMA) determines the optical trap stiffness based on estimation of the particle velocity from statistical trajectories. Using a modification of this technique, we determine the trap stiffness for a two micron particle within 2 ms to a precision of ∼10% using camera measurements at 10 kfps with the contribution of pixel noise to the signal being larger the level Brownian motion. This is done by observing a particle fall into an optical trap once at a high stiffness. This type of calibration is attractive, as it avoids the use of a nanopositioning stage, which makes it ideal for systems of large numbers of particles, e.g., micro-fluidics or active matter systems.

Improved trapping in a vapor-cell magneto-optical trap with multiple laser frequencies

1994 ◽  
Vol 11 (12) ◽  
pp. 2333 ◽  
Author(s):  
Alastair G. Sinclair ◽  
Erling Riis ◽  
Michael J. Snadden
Keyword(s):  
Optical Trap ◽  
Magneto Optical Trap ◽  
Vapor Cell ◽  
Laser Frequencies

Publisher's Note: Evidence of sympathetic cooling of Na+ions by a Na magneto-optical trap in a hybrid trap [Phys. Rev. A86, 063419 (2012)]

2013 ◽  
Vol 87 (1) ◽  
Author(s):  
I. Sivarajah ◽  
D. S. Goodman ◽  
J. E. Wells ◽  
F. A. Narducci ◽  
W. W. Smith
Keyword(s):  
Optical Trap ◽  
Magneto Optical Trap ◽  
Sympathetic Cooling ◽  
Na Ions

Optimization of transfer of laser-cooled atom cloud to a quadrupole magnetic trap

Pramana ◽  
2014 ◽  
Vol 82 (2) ◽  
pp. 419-423
Author(s):  
S P RAM ◽  
S K TIWARI ◽  
S R MISHRA ◽  
H S RAWAT
Keyword(s):  
Magnetic Trap ◽  
Atom Cloud
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