Laser-powered dielectric structure as a micron-scale electron source

We describe a resonant laser-powered structure, measuring 1 mm or less in every dimension, that is capable of generating and accelerating electron beams to low energies (~ 1-2 MeV). Like several other recently investigated dielectric-based accelerators, the device is planar and resonantly excited with a side-coupled laser; however, extensive modifications are necessary for synchronous acceleration and focusing of nonrelativistic particles. Electrons are generated within the device via a novel ferroelectric-based cathode. The accelerator is constructed from dielectric material using conventional microfabrication techniques and powered by a 1 -mum gigawatt laser. The electron beams produced are suitable for a number of existing industrial and medical applications.