In collaboration with Instituto Rocasolano (CSIC, Madrid), who provided laser-irradiated undulated polymer substrates, we have succeeded in the preparation of nanoparticle stripes by self-shadowing deposition of gas-aggregated Pd particles. This novel type of nanostructure, with promising anisotropic properties, was one of the main objectives of our ongoing national project. The synthesis procedure, as well as optical, electrical and hydrogen-detection properties, have been submitted to the journal Applied Surface Science.