Smith–Purcell radiation using a single-tip field emitter

Abstract

We have successfully observed Smith–Purcell radiation (SPR) using a single-tip n-type Si field emitter in the visible wavelength from 400to700nm at low input power level with beam currents of 20–200nA and accelerating voltages of 25–30kV. Several peaks corresponding to the third and fourth harmonics of SPR are obtained using a 550nm period metal grating and redshifted with decrease of the acceleration voltage. The measured peaks are well explained by the SPR theory.

Smith-Purcell Radiation from Ultraviolet to Infrared Using a Si-field Emitter

“…The figure includes the SPR peaks detected with a 550 nm pitch grating. 5 SPR in the wide range from 330 to 1350 nm is clearly observed and the measured wavelengths coincide with the predicted ones form the SPR theory.…”

“…In the previous report, we fabricated a SPR system using a single tip Si field emitter ͑FE͒ and successfully observed the SPR radiation in the visible range at a low input power level with beam currents of 20-200 nA and acceleration voltages of 25-30 kV. 5 The reason why we used such a low input power level and a semiconductor field emitter is because we aim to develop a miniature-size SPR free electron laser and the electron beam from a semiconductor one is relatively easily modulated by laser irradiation, leading to the formation of a bunched beam ͑short pulse beam train͒, respectively. 6 The bunched beam effectively enhances SPR due to the coherent effect.…”

Smith-Purcell radiation from ultraviolet to infrared using a Si field emitter

“…The field emitter was set on a cathode shank, located in the center of the chamber and biased at about −30 kV. 5 SPR in the wide range from 330 to 1350 nm is clearly observed and the measured wavelengths coincide with the predicted ones form the SPR theory. Electron beam must skim a grating, because the electric field interacting with the electron beam decreases exponentially with increasing the beam height from the grating surface.…”

New photo cathode driven by surface plasmon resonance

“…1,2 This wave generation mechanism admits wide range radiation from x-ray to microwave. To obtain high power output, super radiant has been actively studied.…”