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We present experimental results demonstrating multiple order Smith-Purcell radiation in high aspect ratio Silicon Nanowires structures using low-energy electrons (2.5–10keV). These produce emission spanning the visible, paving the way to a fully tunable ultraviolet source.
Focused electron beams can induce electromagnetic radiation from periodic surfaces. We have used low-energy electrons (1.5–6kV) to induce visible light emission from nanoscale gratings (50nm and 60nm). Our results coincide well with numerical simulations.