Results 21 to 30 of about 40,788 (259)

Optical Trapping of Nanoparticles [PDF]

Journal of Visualized Experiments, 2013
Optical trapping is a technique for immobilizing and manipulating small objects in a gentle way using light, and it has been widely applied in trapping and manipulating small biological particles. Ashkin and co-workers first demonstrated optical tweezers using a single focused beam.
Jarrah, Bergeron, Ana, Zehtabi-Oskuie, Saeedeh, Ghaffari, Yuanjie, Pang, Reuven, Gordon   +4 more
openaire   +2 more sources

Optically programmable excitonic traps [PDF]

Scientific Reports, 2013
With atomic systems, optically programmed trapping potentials have led to remarkable progress in quantum optics and quantum information science. Programmable trapping potentials could have a similar impact on studies of semiconductor quasi-particles, particularly excitons.
Mathieu Alloing, Aristide Lemaître, Elisabeth Galopin, François Dubin   +3 more
openaire   +2 more sources

A hybrid method to calculate optical torque: Application to a nano-dumbbell trapped by a metalens

AIP Advances, 2022
The hyper-fast rotation frequency realized in an optical levitation system provides an essential platform for various applications. Benefiting from the development of integrated photonics, optically trapping and manipulating a micro-particle via a ...
Chuang Sun, Jize Yan
doaj   +1 more source

Practical axial optical trapping [PDF]

Review of Scientific Instruments, 2012
We describe a new method for calibrating optical trapping measurements in which tension is applied in the direction of the laser beam to a molecule tethered between a surface and an optically trapped bead. Specifically, we present a generally-applicable procedure for converting from the measured scattering intensity and the measured stage displacement ...
A H, Mack, D J, Schlingman, L, Regan, S G J, Mochrie   +3 more
openaire   +2 more sources

Advances in inorganic nanoparticles trapping stiffness measurement: A promising tool for energy and environmental study

Energy Reviews, 2023
Optical tweezers system has emerged as an efficient tool to manipulate tiny particles in a non-invasive way. Trapping stiffness, as an essential parameter of an optical potential well, represents the trapping stability.
Xiaolin Chen, Jiajie Chen, Jianxing Zhou, Xiaoqi Dai, Yuhang Peng, Yili Zhong, Ho-Pui Ho, Bruce Zhi Gao, Han Zhang, Junle Qu, Yonghong Shao   +10 more
doaj   +1 more source

Scalable trapping of single nanosized extracellular vesicles using plasmonics

Nature Communications, 2023
Heterogeneous nanoscale extracellular vesicles (EVs) are of significant interest for disease detection, monitoring, and therapeutics. However, trapping these nano-sized EVs using optical tweezers has been challenging due to their small size.
Chuchuan Hong, Justus C. Ndukaife
doaj   +1 more source

Enhancing gradient force over scattering force for nano-trapping through compensating for aberration

New Journal of Physics, 2023
One challenge of optical trapping of nanoparticles is the weak trapping force compared to the destabilizing pushing force. Here we enhance the optical gradient force (GF), which is responsible for trapping, to achieve stable nanoparticle trapping through
Dongyong Wang, Xiao Li, Jack Ng
doaj   +1 more source

On-fringe optical trapping of dielectric microparticles in air [PDF]

EPJ Web of Conferences
Optical trapping in air of dielectric micro-spheres is reported using a dual fiber optical tweezers. The spheres are trapped on the interference fringes created by the two counter-propagating optical trapping beams.
Magguilli Clémence, Fick Jochen
doaj   +1 more source

Rydberg-Dressed Magneto-optical Trap [PDF]

Physical Review Letters, 2018
We propose and demonstrate the laser cooling and trapping of Rydberg-dressed Sr atoms. By off-resonantly coupling the excited state of a narrow (7 kHz) cooling transition to a high-lying Rydberg state, we transfer Rydberg properties such as enhanced electric polarizability to a stable magneto-optical trap operating at $< 1 K$.
Bounds, A. D., Jackson, N. C., Hanley, R. K., Faoro, R., Bridge, E. M., Huillery, P., Jones, M. P.A.   +6 more
openaire   +5 more sources

Optical Trapping at Gigapascal Pressures [PDF]

Physical Review Letters, 2013
Diamond anvil cells allow the behavior of materials to be studied at pressures up to hundreds of gigapascals in a small and convenient instrument. However, physical access to the sample is impossible once it is pressurized. We show that optical tweezers can be used to hold and manipulate particles in such a cell, confining micron-sized transparent ...
Bowman, R.W., Gibson, G.M., Padgett, M.J., Saglimbeni, F., Di Leonardo, R.   +4 more
openaire   +3 more sources