Smith–Purcell radiation from low-energy electrons

article Smith–Purcell radiation from low-energy electrons published yes Aviram Massuda author Charles Roques-Carmes author e2e68fc9-6505-11ef-a541-eb4e72cc3e82 Yujia Yang author Steven E. Kooi author Yi Yang author Chitraang Murdia author Karl K. Berggren author Ido Kaminer author Marin Soljačić author Recent advances in the fabrication of nanostructures and nanoscale features in metasurfaces offer new prospects for generating visible light emission from low-energy electrons. Here we present the experimental observation of visible light emission from low-energy free electrons interacting with nanoscale periodic surfaces through the Smith–Purcell (SP) effect. We demonstrate SP light emission from nanoscale gratings with periodicity as small as 50 nm, enabling the observation of tunable visible radiation from low-energy electrons (1.5 to 6 keV), an order of magnitude lower in energy than previously reported. We study the emission wavelength and intensity dependence on the grating pitch and electron energy, showing agreement between experiment and theory. Our results open the way to the production of SP-based nanophotonics integrated devices. Built inside electron microscopes, SP sources could enable the development of novel electron–optical correlated spectroscopic techniques and facilitate the observation of new quantum effects in light sources. American Chemical Society 2018 eng light−matter interactionsperiodic structuresnanophotonicsfree-electron light sources ACS Photonics 2330-4022 1710.0535810.1021/acsphotonics.8b00743 593513-3518 yes Massuda, Aviram, et al. “Smith–Purcell Radiation from Low-Energy Electrons.” ACS Photonics, vol. 5, no. 9, American Chemical Society , 2018, pp. 3513–18, doi:<a href="https://doi.org/10.1021/acsphotonics.8b00743">10.1021/acsphotonics.8b00743</a>. A. Massuda et al., “Smith–Purcell radiation from low-energy electrons,” ACS Photonics, vol. 5, no. 9. American Chemical Society , pp. 3513–3518, 2018. Massuda, A., Roques-Carmes, C., Yang, Y., Kooi, S. E., Yang, Y., Murdia, C., … Soljačić, M. (2018). Smith–Purcell radiation from low-energy electrons. ACS Photonics. American Chemical Society . <a href="https://doi.org/10.1021/acsphotonics.8b00743">https://doi.org/10.1021/acsphotonics.8b00743</a> Massuda, Aviram, Charles Roques-Carmes, Yujia Yang, Steven E. Kooi, Yi Yang, Chitraang Murdia, Karl K. Berggren, Ido Kaminer, and Marin Soljačić. “Smith–Purcell Radiation from Low-Energy Electrons.” ACS Photonics. American Chemical Society , 2018. <a href="https://doi.org/10.1021/acsphotonics.8b00743">https://doi.org/10.1021/acsphotonics.8b00743</a>. A. Massuda, C. Roques-Carmes, Y. Yang, S.E. Kooi, Y. Yang, C. Murdia, K.K. Berggren, I. Kaminer, M. Soljačić, ACS Photonics 5 (2018) 3513–3518. Massuda A, Roques-Carmes C, Yang Y, et al. Smith–Purcell radiation from low-energy electrons. ACS Photonics. 2018;5(9):3513-3518. doi:<a href="https://doi.org/10.1021/acsphotonics.8b00743">10.1021/acsphotonics.8b00743</a> Massuda A, Roques-Carmes C, Yang Y, Kooi SE, Yang Y, Murdia C, Berggren KK, Kaminer I, Soljačić M. 2018. Smith–Purcell radiation from low-energy electrons. ACS Photonics. 5(9), 3513–3518. 215332026-03-30T12:22:47Z2026-04-15T11:48:45Z