Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Baumgartl, Joerg"'
Publikováno v:
Europhys. Lett. 94, 48008 (2011)
We study the non-equilibrium pattern formation that emerges when magnetically repelling colloids, trapped by optical tweezers, are abruptly released, forming colloidal explosions. For multiple colloids in a single trap we observe a pattern of expandi
Externí odkaz:
http://arxiv.org/abs/1009.1930
We report a mathematically rigorous technique which facilitates the optimization of various optical properties of electromagnetic fields. The technique exploits the linearity of electromagnetic fields along with the quadratic nature of their interact
Externí odkaz:
http://arxiv.org/abs/1007.2033
For over a century diffraction theory has been thought to limit the resolution of focusing and imaging in the optical domain. The size of the smallest spot achievable is inversely proportional to the range of spatial wavevectors available. Here, we s
Externí odkaz:
http://arxiv.org/abs/1004.3586
Autor:
Baumgartl, Joerg, Dietrich, Julian, Dobnikar, Jure, Bechinger, Clemens, von Gruenberg, Hans Hennig
Digital video-microscopy measurements are reported of both elastic bandstructures and overdamped phonon decay times in two-dimensional colloidal crystals. Both quantities together allow to determine the friction coefficients along various high symmet
Externí odkaz:
http://arxiv.org/abs/0805.1472
Publikováno v:
Proceedings of SPIE 5514 p.340-351 (2004)
Three-body and four-body interactions have been directly measured in a colloidal system comprised of three (or four) charged colloidal particles. Two of the particles have been confined by means of a scanned laser tweezers to a line-shaped optical tr
Externí odkaz:
http://arxiv.org/abs/0801.3920
We report an experimental study of the elastic properties of a two-dimensional (2D) colloidal crystal subjected to light-induced substrate potentials. In agreement with recent theoretical predictions [H.H. von Gruenberg and J. Baumgartl, Phys. Rev. E
Externí odkaz:
http://arxiv.org/abs/0710.0861
Publikováno v:
Phys. Rev. Lett. 98, 198303 (2007)
Using confocal-microscopy we investigate the structure of binary mixtures of colloidal hard spheres with size ratio q=0.61. As a function of the packing fraction of the two particle species, we observe a marked change of the dominant wavelength in th
Externí odkaz:
http://arxiv.org/abs/0704.0343
It is general wisdom that likely charged colloidal particles repel each other when suspended in liquids. This is in perfect agreement with mean field theories being developed more than 60 years ago. Accordingly, it was a big surprise when several gro
Externí odkaz:
http://arxiv.org/abs/cond-mat/0605106
We report on pair interaction measurements in charged colloidal systems in confined and unconfined geometries by means of optical microscopy. At very small particle distances we observe minute distortions in the optical images which can lead to artif
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503105
Publikováno v:
Proceedings of SPIE; Nov2009 Part 3, Issue 1, p74300C-74300C-8, 8p
