Results 51 to 60 of about 53,610 (191)

Processing carbon nanotubes with holographic optical tweezers

, 2004
We report the first demonstration that carbon nanotubes can be trapped and manipulated by optical tweezers. This observation is surprising because individual nanotubes are substantially smaller than the wavelength of light, and thus should not be ...
Ashkin, Ashkin, Cheong, Curtis, Dai, Daniel M. Mueth, David G. Grier, Dufresne, Evan Tanner, Gahagan, Grier, He, Joseph Plewa, Korda, Lim, Nagahara, O’Connell, Simpson, Suehiro, Yu   +19 more
core   +1 more source

Holographic Optical Tweezers at the Tip of a Needle [PDF]

, 2018
Fibre-based optical tweezers typically rely on engineered fibre terminations yielding limited flexibility in number and positioning of trap sites. Here, we demonstrate holographic optical tweezers delivered by a lensless, high-NA multimode fibre with ...
Cizmar, Tomaa, Cuschieri, Alfred, Jiang, Xin, Leite, Ivo T., Russell, Philip St J., Siler, Martin, Turtaev, Sergey   +6 more
core   +2 more sources

Microscopic Control and Detection of Ultracold Strontium in Optical-Tweezer Arrays

Physical Review X, 2018
Optical tweezers provide a versatile platform for the manipulation and detection of single atoms. Here, we use optical tweezers to demonstrate a set of tools for the microscopic control of atomic strontium, which has two valence electrons.
M. A. Norcia, A. W. Young, A. M. Kaufman   +2 more
doaj   +1 more source

Acousto-holographic optical tweezers

Optics Letters, 2020
Acousto-optic deflectors (AODs) allow the creation of multiple optical traps by time-sharing, that is, by rapidly cycling the laser focus between designated spatial locations. The traps thus formed are not permanent. In this Letter, we successfully demonstrate the creation of multiple and permanent traps by means of AODs driven by specially encoded ...
R. Bola, D. Treptow, A. Marzoa, M. Montes-Usategui, E. Martín-Badosa   +4 more
openaire   +5 more sources

Optical tweezing of microparticles and cells using silicon-photonics-based optical phased arrays

Nature Communications
Integrated optical tweezers have the potential to enable highly-compact, low-cost, mass-manufactured, and broadly-accessible optical manipulation when compared to standard bulk-optical tweezers.
Tal Sneh, Sabrina Corsetti, Milica Notaros, Kruthika Kikkeri, Joel Voldman, Jelena Notaros   +5 more
doaj   +1 more source

Drug Targeting Model of Composite Gold-Tourmaline for Cells Enhancing Applications

Nano Biomedicine and Engineering, 2015
The drug delivery and targeting method of gold tourmaline composite atoms generated by optical tweezers in a micro-optical device system is proposed.
Preecha P. Yupapin, Senee Suwandee
doaj   +1 more source

Optical tweezers: wideband microrheology

, 2010
Microrheology is a branch of rheology having the same principles as conventional bulk rheology, but working on micron length scales and micro-litre volumes.
Cooper, Jonathan M., Evans, R. M. L., Gibson, Graham M., Padgett, Miles J., Preece, Daryl, Tassieri, Manlio, Warren, Rebecca   +6 more
core   +1 more source

Position clamping in a holographic counterpropagating optical trap [PDF]

, 2011
Optical traps consisting of two counterpropagating, divergent beams of light allow relatively high forces to be exerted along the optical axis by turning off one beam, however the axial stiffness of the trap is generally low due to the lower numerical ...
Alexander Jesacher, Alexandrov, Ashkin, Ashkin, Bowman, Bowman, Constable, Dam, Dam, Graham Gibson, Gregor Thalhammer, Grier, Guck, Lee, Miles Padgett, Molloy, Molloy, Monika Ritsch-Marte, Neuman, Otto, Perch-Nielsen, Pitzek, Preece, Reicherter, Richard Bowman, Rodrigo, Rodrigo, Sehgal, Sinclair, Svoboda, Tauro, Thalhammer, Wallin, Woerdemann, Wulff, Zwick   +35 more
core   +1 more source

Magnetic tweezers to capture the fast-folding λ6-85 in slow motion

Communications Physics
Force spectroscopy gives access to the underlying free energy landscape of protein folding. Proteins exhibit folding rates between microseconds and hours.
César Augusto Quintana-Cataño, Ann Mukhortava, Mordjane A. Boukhet, Andreas Hartmann, Karl-Ludwig Schumann, Michael Schlierf   +5 more
doaj   +1 more source

Fundamental constraints on particle tracking with optical tweezers

, 2012
A general quantum limit to the sensitivity of particle position measurements is derived following the simple principle of the Heisenberg microscope. The value of this limit is calculated for particles in the Rayleigh and Mie scattering regimes, and with ...
Ditchburn R W, Huffman D R, Joachim Knittel, Michael A Taylor, Nieminen T A, Stefszky M S, Taylor M A, Taylor M A, Warwick P Bowen   +8 more
core   +1 more source