Heating of trapped particles close to surfaces - Blackbody and beyond

We discuss heating and decoherence in traps for ions and neutral particles close to metallic surfaces. We focus on simple trap geometries and compute noise spectra of thermally excited electromagnetic fields. If the trap is l ocated in the near field of the substrate, the field fluctuations are large ly increased compared to the level of the blackbody field, leading to much shorter coherence and life times of the trapped atoms. The corresponding ti me constants are computed for ion traps and magnetic traps. Analytical esti mates for the size dependence of the noise spectrum are given. We finally d iscuss prospects for the coherent transport of matter waves in integrated s urface waveguides.