Jochen Müller | Searcharxiv

arXiv2007

Waveguide properties of single subwavelength holes demonstrated with radially and azimuthally polarized light

We investigate the transmission of focused beams through single subwavelength holes in a silver film. We use radially and azimuthally polarized light, respectively, to excite higher order waveguide modes as well as to match the radial symmetry of the aperture geometry. Remarkably, the transmission properties can be described by a classical waveguide model even for thicknesses of the silver film as thin as a quarter of a wavelength.

physics.optics↗

arXiv1995

Interaction-induced delocalization of two particles in a random potential: Scaling properties

The localization length $ξ_2$ for coherent propagation of two interacting particles in a random potential is studied using a novel and efficient numerical method. We find that the enhancement of $ξ_2$ over the one-particle localization length $ξ_1$ satisfies the scaling relation $ξ_2/ξ_1=f(u/Δ_ξ)$, where $u$ is the interaction strength and $Δ_ξ$ the level spacing of a wire of length $ξ_1$. The scaling function $f$ is linear over the investigated parameter range. This implies that $ξ_2$ increases faster with $u$ than previously predicted. We also study a novel mapping of the problem to a banded-random-matrix model.

cond-mat↗