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Problem Addressed

The Smith-Purcell Effect is a light emission method induced by free electrons coupled to the electromagnetic modes of a periodic structure that diffracts light into several wavelengths. The wavelength of radiation is dependent on the velocity of the free electrons and the geometry of the periodic structure. Smith-Purcell light sources typically use a metallic periodic structure and adjust emission wavelength through electron velocity. Unfortunately, the output of conventional light sources is too weak for realistic application due to a range of nanoscale technical issues, from phase mismatch between electrons and emitted photons to misalignment of the electron beam and the periodic structure.