Irradiation of Dye-Doped Microspheres with a Strongly Focused Laser Beam Results in Alignment upon Optical Trapping

Nano Letters ◽  
2002 ◽  
Vol 2 (3) ◽  
pp. 207-210 ◽  
Author(s):  
Garth J. Simpson ◽  
Thorsten Wohland ◽  
Richard N. Zare
Keyword(s):  
Laser Beam ◽  
Optical Trapping

Optical trapping near a colloidal cluster formed by a weakly focused laser beam

2008 ◽  
Vol 41 (10) ◽  
pp. 105107 ◽  
Author(s):  
S Ahlawat ◽  
R Dasgupta ◽  
P K Gupta
Keyword(s):  
Laser Beam ◽  
Optical Trapping

scholarly journals Micro-Dumbbells—A Versatile Tool for Optical Tweezers

2018 ◽  
Author(s):  
Weronika Lamperska ◽  
Sławomir Drobczyński ◽  
Michał Nawrot ◽  
Piotr Wasylczyk ◽  
Jan Masajada
Keyword(s):  
Laser Beam ◽  
Optical Tweezers ◽  
Optical Trapping ◽  
Viscosity Measurements ◽  
Two Photon ◽  
Vibration Detection ◽  
Holographic Optical Tweezers ◽  
Versatile Tool ◽  
Micro Tool

Manipulation of micro- and nano-sized objects with optical tweezers is a well established, albeit still evolving technique. While many objects can be trapped directly with focused laser beam(s), for some applications indirect manipulation with tweezers-operated tools is preferred. We introduce a simple, versatile micro-tool operated with holographic optical tweezers. The 40 µm long dumbbell-shaped tool, fabricated with two-photon laser 3D photolithography has two beads for efficient optical trapping and a probing spike on one end. We demonstrate fluids viscosity measurements and vibration detection as examples of possible applications.

Improvement of optical trapping effect by structuring the illuminating laser beam

Optik ◽  
2022 ◽  
Vol 251 ◽  
pp. 168439
Author(s):  
S. Haddadi ◽  
K. Ait-Ameur
Keyword(s):  
Laser Beam ◽  
Optical Trapping ◽  
Trapping Effect

scholarly journals Optical-trapping of particles in air using parabolic reflectors and a hollow laser beam

2019 ◽  
Vol 27 (23) ◽  
pp. 33061 ◽  
Author(s):  
Yong-Le Pan ◽  
Aimable Kalume ◽  
Isaac C. D. Lenton ◽  
Timo A. Nieminen ◽  
Alex B. Stilgoe ◽  
...  
Keyword(s):  
Laser Beam ◽  
Optical Trapping ◽  
Parabolic Reflectors ◽  
Hollow Laser Beam

Red blood cell in the field of a beam of optical tweezers

2022 ◽  
Vol 52 (1) ◽  
pp. 22-27
Author(s):  
P B Ermolinskiy ◽  
A E Lugovtsov ◽  
A N Semenov ◽  
A V Priezzhev
Keyword(s):  
Blood Cell ◽  
Laser Beam ◽  
Red Blood Cells ◽  
Optical Tweezers ◽  
Red Blood Cell ◽  
Blood Cells ◽  
Optical Trapping ◽  
Optical Trap ◽  
Beam Power ◽  
Deformation Properties

Abstract We consider the effect of a tightly focused laser beam with a wavelength of 1064 nm and a power from 10 to 160 mW on red blood cells during their optical trapping with optical tweezers. It is found that the shape of a red blood cell, which alters after optical trapping, ceases to change when the trapping duration is less than 5 min and the laser beam power is less than 60 mW. At a beam power above 80 mW, the red blood cell begins to fold at a trapping duration of about 1 min, and at powers above 100-150 mW, the red blood cell membrane ruptures in 1-3 min after optical trapping. It is also found that with repeated short-term capture of a red blood cell in an optical trap, the deformation properties of the membrane change: it becomes more rigid. The obtained results are important both for understanding the mechanisms of interaction of a laser beam with red blood cells and for optimising the technique of optical experiments, especially for measuring the deformation properties of a membrane using optical tweezers.

Calculation of optical trapping forces on a dielectric sphere in the ray optics regime produced by a radially polarized laser beam

2007 ◽  
Vol 32 (13) ◽  
pp. 1839 ◽  
Author(s):  
Hikaru Kawauchi ◽  
Kazuhiro Yonezawa ◽  
Yuichi Kozawa ◽  
Shunichi Sato
Keyword(s):  
Laser Beam ◽  
Optical Trapping ◽  
Dielectric Sphere ◽  
Ray Optics ◽  
Trapping Forces ◽  
Radially Polarized

Optically Driven Micromanipulation Tools Fabricated by Two-photon Microstereolithography

2002 ◽  
Vol 739 ◽  
Author(s):  
Shoji Maruo ◽  
Koji Ikuta ◽  
Hayato Korogi
Keyword(s):  
Laser Beam ◽  
Biological Samples ◽  
Living Cell ◽  
Optical Trapping ◽  
Cell Protein ◽  
Two Photon ◽  
Focal Position ◽  
Handling Method

ABSTRACTLight-driven micromanipulators have been developed by two-photon microstereolithography. The manipulators are driven and controlled by optical trapping. The torque of micromanipulator was successfully controlled on the order of femto-newton by adjusting the focal position of the trapped laser beam. Nanotweezers and a nanoneedle with probe tip of diameter 250 nm were fabricated and driven in a liquid. Such remote-controlled manipulation tools provide a unique and effective handling method of biological samples such as living cell, protein and DNA.

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