Orientation of swimming cells with annular beam optical tweezers (Conference Presentation)

2020 ◽  
Author(s):  
Declan Armstrong ◽  
Isaac C. Lenton ◽  
Halina Rubinsztein-Dunlop ◽  
Timo A. Nieminen ◽  
Alexander B. Stilgoe ◽  
...  
Keyword(s):  
Optical Tweezers ◽  
Annular Beam

scholarly journals Optical Trapping and Manipulation of Superparamagnetic Beads Using Annular-Shaped Beams

2018 ◽  
Vol 1 (4) ◽  
pp. 44 ◽  
Author(s):  
Leandro Oliveira ◽  
Warlley Campos ◽  
Marcio Rocha
Keyword(s):  
Optical Tweezers ◽  
Laser Power ◽  
Optical Trapping ◽  
Spherical Aberration ◽  
Superparamagnetic Particles ◽  
Annular Beam ◽  
Superparamagnetic Beads ◽  
Laser Absorption ◽  
Magnetic Forces ◽  
Beam Geometry

We propose an optical tweezers setup based on an annular-shaped laser beam that is efficient to trap 2.8 μ m-diameter superparamagnetic particles. The optical trapping of such particles was fully characterized, and a direct absolute comparison with a geometrical optics model was performed. With this comparison, we were able to show that light absorption by the superparamagnetic particles is negligible for our annular beam tweezers, differing from the case of conventional Gaussian beam tweezers, in which laser absorption by the beads makes stable trapping difficult. In addition, the trap stiffness of the annular beam tweezers increases with the laser power and with the bead distance from the coverslip surface. While this first result is expected and similar to that achieved for conventional Gaussian tweezers, which use ordinary dielectric beads, the second result is quite surprising and different from the ordinary case, suggesting that spherical aberration is much less important in our annular beam geometry. The results obtained here provide new insights into the development of hybrid optomagnetic tweezers, which can apply simultaneously optical and magnetic forces on the same particles.

scholarly journals Orientation of swimming cells with annular beam optical tweezers

2020 ◽  
Vol 459 ◽  
pp. 124864 ◽  
Author(s):  
Isaac C.D. Lenton ◽  
Declan J. Armstrong ◽  
Alexander B. Stilgoe ◽  
Timo A. Nieminen ◽  
Halina Rubinsztein-Dunlop
Keyword(s):  
Optical Tweezers ◽  
Annular Beam

Defining the trapping limits of holographical optical tweezers

2004 ◽  
Vol 51 (3) ◽  
pp. 409-414 ◽  
Author(s):  
P. Jordan ◽  
J. Leach ◽  
M. J. Padgett ◽  
J. Cooper ◽  
G. Sinclair
Keyword(s):  
Optical Tweezers

Performance Analysis of Lunar Spacecraft Navigation Based on Inter-Satellite Link Annular Beam Antenna

2016 ◽  
Vol E99.B (4) ◽  
pp. 951-959
Author(s):  
Lei CHEN ◽  
Ke ZHANG ◽  
Yangbo HUANG ◽  
Zhe LIU ◽  
Gang OU
Keyword(s):  
Performance Analysis ◽  
Satellite Link ◽  
Annular Beam ◽  
Spacecraft Navigation

Electromagnetic-matter interactions and devices

2017 ◽  
Author(s):  
Sandip Tiwari
Keyword(s):  
Optical Tweezers ◽  
Quantum Cascade Lasers ◽  
Accelerator Physics ◽  
X Ray ◽  
Quantum Cascade ◽  
Inorganic Systems ◽  
Charge Cloud ◽  
Atomic Distance ◽  
Extinction Length ◽  
Cascade Lasers

This chapter explores electromagnetic-matter interactions from photon to extinction length scales, i.e., nanometer of X-ray and above. Starting with Casimir-Polder effect to understand interactions of metals and dielectrics at near-atomic distance scale, it stretches to larger wavelengths to explore optomechanics and its ability for energy exchange and signal transduction between PHz and GHz. This range is explored with near-quantum sensitivity limits. The chapter also develops the understanding phononic bandgaps, and for photons, it explores the use of energetic coupling for useful devices such as optical tweezers, confocal microscopes and atomic clocks. It also explores miniature accelerators as a frontier area in accelerator physics. Plasmonics—the electromagnetic interaction with electron charge cloud—is explored for propagating and confined conditions together with the approaches’ possible uses. Optoelectronic energy conversion is analyzed in organic and inorganic systems, with their underlying interaction physics through solar cells and its thermodynamic limit, and quantum cascade lasers.

scholarly journals Protocol to measure the membrane tension and bending modulus of cells using optical tweezers and scanning electron microscopy

2021 ◽  
Vol 2 (1) ◽  
pp. 100283
Author(s):  
Pedro Pompeu ◽  
Pedro S. Lourenço ◽  
Diney S. Ether ◽  
Juliana Soares ◽  
Jefte Farias ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Optical Tweezers ◽  
Membrane Tension ◽  
Bending Modulus ◽  
Scanning Electron
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