Transverse force profiles of individual dielectric particles in an optical trap

2012 ◽  
Author(s):  
Ming-Tzo Wei ◽  
Jack Ng ◽  
C. T. Chan ◽  
Arthur Chiou ◽  
H. Daniel Ou-Yang
Keyword(s):  
Optical Trap ◽  
Transverse Force ◽  
Dielectric Particles ◽  
Force Profiles

Observation of a single-beam gradient-force optical trap for dielectric particles in air

1997 ◽  
Vol 22 (11) ◽  
pp. 816 ◽  
Author(s):  
Ryota Omori ◽  
Tamiki Kobayashi ◽  
Atsuyuki Suzuki
Keyword(s):  
Optical Trap ◽  
Gradient Force ◽  
Single Beam ◽  
Dielectric Particles

Optical tweezers as a tool to study cellular function

1992 ◽  
Vol 50 (1) ◽  
pp. 424-425
Author(s):  
Steven M. Block
Keyword(s):  
Optical Tweezers ◽  
Optical Trap ◽  
Three Dimensional ◽  
Characteristic Size ◽  
Gradient Force ◽  
Single Beam ◽  
Temporal Precision ◽  
Dielectric Particles ◽  
Ligand Interactions ◽  
20 Nm

A single beam gradient force optical trap1-3, or “optical tweezers”, exerts forces on microscopic dielectric particles using a highly focused beam of laser light, and can achieve stable, three-dimensional trapping of such particles (for a review, see ref. 4). Using an infrared laser, calibratable forces in the piconewton (pN) range can be easily generated without causing significant damage to living biological specimens. Optical tweezers work through the microscope, without mechanical intrusion within sealed preparations, and can even reach directly inside transparent cells or organelles. Because it is formed by light, an optical trap can be controlled with very high spatial and temporal precision. Its characteristic size (i.e., its “grasp”) is approximately equal to the wavelength of light, but it can be used to capture and/or manipulate objects ranging in size from ∼20 nm to ∼100 mm. Biological preparations (e.g., cells, vesicles, organelles) or small particles (e.g., latex or silica microspheres, perhaps carrying reagents coupled to their surfaces) can be held, maneuvered, or released at will. Already, researchers have begun to contemplate experiments that were practically impossible just a few years ago. Some possibilities include: (1) the sorting and isolation of cells, vesicles, organelles, chromosomes, etc.; (2) the direct measurement of the mechanical properties of cytoskeletal assemblies, membranes, or membrane-bound elements; (3) measurement of the tiny forces produced by mechanoenzymes; (4) establishing cell-cell contacts, or measuring receptor-ligand interactions; (5) studying cellular rheology on the micrometer scale; (6) doing cellular microsurgery, membrane fusion, and building novel cellular (or noncellular) structures; (7) capturing and maintaining fragile biological structures away from vessel surfaces, in order to study them in isolation under optimal viewing conditions; (8) and much more! The principles by which optical tweezers work will be explained, and a videotape illustrating a number of experimental uses will be shown.

Investigation of the factors affecting the transverse force measurements of an optical trap: II

2002 ◽  
Author(s):  
Amanda Wright ◽  
Tiffany A. Wood ◽  
Mark R. Dickinson ◽  
Helen F. Gleeson ◽  
Tom Mullin ◽  
...  
Keyword(s):  
Optical Trap ◽  
Transverse Force ◽  
Force Measurements ◽  
Factors Affecting

Factors affecting the transverse force measurements of an optical trap: I

2002 ◽  
Author(s):  
Tiffany A. Wood ◽  
Amanda Wright ◽  
Helen F. Gleeson ◽  
Mark Dickenson ◽  
Tom Mullin ◽  
...  
Keyword(s):  
Optical Trap ◽  
Transverse Force ◽  
Force Measurements ◽  
Factors Affecting

scholarly journals Creation of Hollow-Gaussian Beam for Optical Trap by Dual-beam Nonliear Fabry-perot Interferometer

2021 ◽  
Vol 31 (3) ◽  
Author(s):  
Nguyen Manh Thang
Keyword(s):  
Gaussian Beam ◽  
Optical Trap ◽  
Pump Intensity ◽  
Signal Beam ◽  
Gaussian Beams ◽  
Spatial Intensity Distribution ◽  
Dielectric Particles ◽  
Dual Beam ◽  
Fabry Perot ◽  
Optical Mirrors

In this paper, a model of dual-beam nonlinear Fabry-Perot interferometer (DBNFPI) for creation laser hollow-Gaussian beam (HGB) is investigated. It includes a thin film of organic dye sandwiched between two optical mirrors, and irradiated by two signal and pump laser Gaussian beams. Based on the equation describing the output-input relation of intensities concerning pump intensity and the expression of the spatial intensity distribution of output signal beam (OSB), the range of pump intensity and collection of designed parameters are numerically calculated and discussed for HGB creation. These results give us the opportunity to use DBNFPI for optical trap of low-index dielectric particles.

Observation of a single-beam gradient force optical trap for dielectric particles

1986 ◽  
Vol 11 (5) ◽  
pp. 288 ◽  
Author(s):  
A. Ashkin ◽  
J. M. Dziedzic ◽  
J. E. Bjorkholm ◽  
Steven Chu
Keyword(s):  
Optical Trap ◽  
Gradient Force ◽  
Single Beam ◽  
Dielectric Particles

scholarly journals Radiation induced Rotation of Interplanetary Dust Particles; a Feasibility Study for a Space Experiment

1980 ◽  
Vol 90 ◽  
pp. 391-394 ◽  
Author(s):  
Keith F. Ratcliff ◽  
Nebil Y. Misconi ◽  
Stephen J. Paddack
Keyword(s):  
Optical Trap ◽  
Argon Laser ◽  
Interplanetary Dust ◽  
Dust Particles ◽  
Surface Geometry ◽  
Interplanetary Dust Particles ◽  
Dielectric Particles ◽  
Radiation Induced ◽  
Optical Levitation ◽  
Free Environment

Irregular interplanetary dust particles may acquire a considerable spin rate due to two non-statistical dynamical mechanisms induced by solar radiation. These arise from variations in surface albedo as discussed by Radzievskii (1954) and from irregularities in surface geometry as discussed by Paddack (1969). We report on an experiment which will lead to an evaluation in space of the effectiveness of these two spin mechanisms. We utilize the technique of optical levitation in an argon laser beam to provide a stable trap for particles (10-60 microns in diameter). The spin rate and direction of the spin axis are measured in a straightforward manner. The objective is to design an optical trap for dielectric particles in vacuum which can be used to study these rotation mechanisms in the gravity-free environment of a Spacelab experiment.

Optical tweezers: 20 years on

2006 ◽  
Vol 364 (1849) ◽  
pp. 3521-3537 ◽  
Author(s):  
David McGloin
Keyword(s):  
Laser Beam ◽  
Recent Work ◽  
Optical Tweezers ◽  
Optical Trap ◽  
Critical Discussion ◽  
Optical Manipulation ◽  
Gradient Force ◽  
Seminal Paper ◽  
Single Beam ◽  
Dielectric Particles

In 1986, Arthur Ashkin and colleagues published a seminal paper in Optics Letters , ‘Observation of a single-beam gradient force optical trap for dielectric particles’ which outlined a technique for trapping micrometre-sized dielectric particles using a focused laser beam, a technology which is now termed optical tweezers. This paper will provide a background in optical manipulation technologies and an overview of the applications of optical tweezers. It contains some recent work on the optical manipulation of aerosols and concludes with a critical discussion of where the future might lead this maturing technology.

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