FIELD EMISSION PHOTOCATHODE ARRAY COMPRISING AN ADDITIONAL LAYER TO IMPROVE THE YIELD AND ELECTRON OPTICAL IMAGING SYSTEM USING THE SAME

摘要

An electron source provided with a substrate layer (17) and a semiconductor layer (16) with at least one tip (19), the substrate layer (17) being suitable for receiving light of a first wavelength and transmitting the light to the semiconductor layer (16) that is suitable to convert the light into electrons by a photo-electric effect, the substrate layer (17) being provided with a fluorescent layer (17(2)) to convert the light of the first wavelength into light with a second wavelength larger than the first wavelength.