We present a new approach to a nanogenerator (NG) that is composed of integrated, paired nanobrushes made of pyramid-shaped metal-coated ZnO nanotip (NTP) arrays and hexagonal-prism-shaped ZnO nanowire (NW) arrays, which were synthesized using a chemical approach at <100 degrees C on the two surfaces of a common substrate, respectively. The operation of the NGs relies on mechanical deflection/b...

The generation of highly collimated electron beams from a double-gate field emitter array with 40000 metallic tips and large collimation gate apertures is reported. Field emission beam measurements demonstrated the reduction of the beam envelope down to the array size by applying a negative potential to the on-chip gate electrode for the collimation of individual field emission beamlets. Owing ...

Abstract The coherent modulation of swift electron beams with strong laser fields has enabled the generation attosecond pulses, opening up new research avenues in ultrafast science. Here we study a comparatively simple alternative, production pulse trains directly at source. In our theory work, show that sub-optical-cycle bursts induced by tunneling photoemission from metal nanotip can retain te...