arXiv subjects

V. Bortolani

Publications and source records attributed to V. Bortolani.

2 recordsLinked to original sources

arXiv2000

Multiple energy x-ray holography: the polarization effect

We present the theory for Multiple Energy X-ray Holography (MEXH), using a multipole expansion for the scattered field. We find that light polarization plays a crucial role in the reconstruction of the image, and we suggest how to use it in order to eliminate aberration effects. The method we propose is alternative to the SWIFT method (scattered-wave--included Fourier transform), but has the advantage that no theoretical calculations are required to redefine the hologram.

cond-mat↗

arXiv2000

Spontaneous pattern formation in driven nonlinear lattice

We demonstrate the spontaneous formation of spatial patterns in a damped, ac-driven cubic Klein-Gordon lattice. These patterns are composed of arrays of intrinsic localized modes characteristic for nonlinear lattices. We analyze the modulation instability leading to this spontaneous pattern formation. Our calculation of the modulational instability is applicable in one and two-dimensional lattices, however in the analyses of the emerging patterns we concentrate particularly on the two-dimensional case.

nlin.PS↗