Results 41 to 50 of about 4,302 (205)

Composite Diffraction-Free Beam Formation Based on Iteratively Calculated Primitives

Micromachines, 2023
To form a diffraction-free beam with a complex structure, we propose to use a set of primitives calculated iteratively for the ring spatial spectrum. We also optimized the complex transmission function of the diffractive optical elements (DOEs), which ...
Pavel A. Khorin, Alexey P. Porfirev, Svetlana N. Khonina   +2 more
doaj   +1 more source

Particle tracking stereomicroscopy in optical tweezers: control of trap shape [PDF]

, 2010
We present an optical system capable of generating stereoscopic images to track trapped particles in three dimensions. Two-dimensional particle tracking on each image yields three dimensional position information.
Asavei, Ashkin, Ashkin, Cheong, Cizmar, Crocker, Dam, Dam, Galajda, Gibson, Graham Gibson, Grier, Ikin, Leach, Leach, Lee, McLeod, Miles Padgett, Otto, O’Neil, Pacoret, Pavani, Pavani, Perch-Nielsen, Preece, Reicherter, Richard Bowman, Rodrigo, Rodrigo, Rohrbach, Sinclair, Singer, Speidel, Svoboda, Zhang   +34 more
core   +1 more source

Increasing trap stiffness with position clamping in holographic optical tweezers [PDF]

, 2009
We present a holographic optical tweezers system capable of position clamping multiple particles. Moving an optical trap in response to the trapped object's motion is a powerful technique for optical control and force measurement.
Bowman, R., Gibson, G., Linnenberger, A., Padgett, M., Preece, D., Serati, S.   +5 more
core   +1 more source

Position clamping of optically trapped microscopic non-spherical probes [PDF]

, 2011
We investigate the degree of control that can be exercised over an optically trapped microscopic non-spherical force probe. By position clamping translational and rotational modes in different ways, we are able to dramatically improve the position ...
Bowman, R., Carberry, D.M., Gibson, G.M., Grieve, J.A., Miles, M.J., Padgett, M.J., Phillips, David, Simpson, S.H.   +7 more
core   +1 more source

Compliant rolling-contact architected materials for shape reconfigurability

Nature Communications, 2018
The authors introduce a compliant rolling-contact architected material as a class of shape reconfigurable mechanical metamaterial. They also devise an approach that combines two photon stereolithography and scanning holographic optical tweezers, which ...
Lucas A. Shaw, Samira Chizari, Matthew Dotson, Yuanping Song, Jonathan B. Hopkins   +4 more
doaj   +1 more source

Optically controlled grippers for manipulating micron-sized particles [PDF]

, 2007
We report the development of a joystick controlled gripper for the real-time manipulation of micron-sized objects, driven using holographic optical tweezers (HOTs).
Ashkin A, Fiona Beck, Graeme Whyte, Graham Gibson, Louise Barron, Miles Padgett, Reicherter M, Sato S, Tan K L   +8 more
core   +3 more sources

Improved two-photon photopolymerisation and optical trapping with aberration-corrected structured light

Frontiers in Nanotechnology, 2022
We demonstrate the effectiveness of phase only aberration corrections of structured light and their application to versatile optical trapping setups. We calculate phase corrections before (ex-situ) and after (in-situ) a high numerical aperture microscope
D. J. Armstrong, A. B Stilgoe, T. A. Nieminen, H. Rubinsztein-Dunlop   +3 more
doaj   +1 more source

Classical and Quantum Gases on a Semiregular Mesh

Applied Sciences, 2021
The main objective of a statistical mechanical calculation is drawing the phase diagram of a many-body system. In this respect, discrete systems offer the clear advantage over continuum systems of an easier enumeration of microstates, though at the cost ...
Davide De Gregorio, Santi Prestipino
doaj   +1 more source

Holographic optical trapping

, 2005
Holographic optical tweezers use computer-generated holograms to create arbitrary three-dimensional configurations of single-beam optical traps useful for capturing, moving and transforming mesoscopic objects.
Allen, Alonzo, Arlt, Ashkin, Ashkin, Crocker, Curtis, Curtis, Dufresne, Dufresne, Gahagan, Garces-Chavez, Grier, Guo, He, He, Hughes, Jesacher, Jordan, Korda, Koss, Ladavac, Ladavac, Leach, Liesener, MacDonald, Meister, Melville, Mogensen, Neto, O'Neil, Polin, Reicherter, Reimann, Roichman, Sacks, Sasaki, Simpson, Sinclair, Soskin, Sundbeck   +40 more
core   +1 more source

Biomechanical properties of native and cultured red blood cells–Interplay of shape, structure and biomechanics

Frontiers in Physiology, 2022
Modern medicine increases the demand for safe blood products. Ex vivo cultured red blood cells (cRBC) are eagerly awaited as a standardized, safe source of RBC.
Claudia Bernecker, Maria Lima, Maria Lima, Tatjana Kolesnik, Annika Lampl, Catalin Ciubotaru, Riccardo Leita, Dagmar Kolb, Dagmar Kolb, Eleonore Fröhlich, Peter Schlenke, Gerhard A. Holzapfel, Gerhard A. Holzapfel, Isabel Dorn, Dan Cojoc   +14 more
doaj   +1 more source