Zobrazeno 1 - 10
of 134
pro vyhledávání: '"Heckenberg, Norman R."'
Autor:
Garrett, Michael C., Ratnapala, Adrian, van Ooijen, Eikbert D., Vale, Christopher J., Weegink, Kristian, Schnelle, Sebastian K., Vainio, Otto, Heckenberg, Norman R., Rubinsztein-Dunlop, Halina, Davis, Matthew J.
Publikováno v:
Phys. Rev. A 83, 013630 (2011)
We study the formation of a Bose-Einstein condensate in a cigar-shaped three-dimensional harmonic trap, induced by the controlled addition of an attractive "dimple" potential along the weak axis. In this manner we are able to induce condensation with
Externí odkaz:
http://arxiv.org/abs/1011.0296
Autor:
Lenz, Martin, Wüster, Sebastian, Vale, Christopher J., Heckenberg, Norman R., Rubinsztein-Dunlop, Halina, Holmes, C. A., Milburn, G. J., Davis, Matthew J.
Publikováno v:
Phys. Rev. A 88, 013635 (2013)
The study of dynamical tunnelling in a periodically driven anharmonic potential probes the quantum-classical transition via the experimental control of the effective Planck's constant for the system. In this paper we consider the prospects for observ
Externí odkaz:
http://arxiv.org/abs/1011.0242
Autor:
Nieminen, Timo A., Asavei, Theodor, Loke, Vincent L. Y., Heckenberg, Norman R., Rubinsztein-Dunlop, Halina
A key element in the generation of optical torque in optical traps, which occurs when electromagnetic angular momentum is transferred from the trapping beam to the trapped particle by scattering, is the symmetries of the scattering particle and the t
Externí odkaz:
http://arxiv.org/abs/0812.2039
Two-photon photopolymerization of UV curing resins is an attractive method for the fabrication of microscopic transparent objects with size in the tens of micrometers range. We have been using this method to produce three-dimensional structures for o
Externí odkaz:
http://arxiv.org/abs/0810.5585
Autor:
Parkin, Simon J., Knoener, Gregor, Nieminen, Timo A., Heckenberg, Norman R., Rubinsztein-Dunlop, Halina
Publikováno v:
Phys.Rev.E76:041507,2007
Important aspects in the field of microrheology are the studies of the viscosity of fluids within structures with micron dimensions and fluid samples where only microlitre volumes are available. We have quantitatively investigated the performance and
Externí odkaz:
http://arxiv.org/abs/0711.0060
Publikováno v:
Rev.Mod.Phys.79:1197-1216,2007; Erratum-ibid.81:443,2009
Almost a hundred years ago, two different expressions were proposed for the energy--momentum tensor of an electromagnetic wave in a dielectric. Minkowski's tensor predicted an increase in the linear momentum of the wave on entering a dielectric mediu
Externí odkaz:
http://arxiv.org/abs/0710.0461
Publikováno v:
Physical Review E 75(1), 011916 (2007)
The size of particles which can be trapped in optical tweezers ranges from tens of nanometres to tens of micrometres. This size regime also includes large single molecules. Here we present experiments demonstrating that optical tweezers can be used t
Externí odkaz:
http://arxiv.org/abs/physics/0702044
Autor:
Knoener, Gregor, Parkin, Simon, Nieminen, Timo A., Heckenberg, Norman R., Rubinsztein-Dunlop, Halina
Publikováno v:
Physical Review Letters 97(15), 157402 (2006)
The refractive index of single microparticles is derived from precise measurement and rigorous modeling of the stiffness of a laser trap. We demonstrate the method for particles of four different materials with diameters from 1.6 to 5.2 microns and a
Externí odkaz:
http://arxiv.org/abs/physics/0610087
Autor:
Loke, Vincent L. Y., Nieminen, Timo A., Branczyk, Agata M., Heckenberg, Norman R., Rubinsztein-Dunlop, Halina
Publikováno v:
pp. 163-166 in Nikolai Voshchinnikov (ed.), 9th International Conference on Electromagnetic and Light Scattering by Non-Spherical Particles: Theory, Measurements, and Applications (St. Petersburg State University, St. Petersburg, 2006)
A strongly focused laser beam can be used to trap, manipulate and exert torque on a microparticle. The torque is the result of transfer of angular momentum by scattering of the laser beam. The laser could be used to drive a rotor, impeller, cog wheel
Externí odkaz:
http://arxiv.org/abs/physics/0607286
Autor:
Parkin, Simon, Knoener, Gregor, Nieminen, Timo A., Heckenberg, Norman R., Rubinsztein-Dunlop, Halina
Publikováno v:
Optics Express, 14(15), 6963-6970 (2006)
We describe a way to determine the total angular momentum, both spin and orbital, transferred to a particle trapped in optical tweezers. As an example an LG02 mode of a laser beam with varying degrees of circular polarisation is used to trap and rota
Externí odkaz:
http://arxiv.org/abs/physics/0607216