@article{21538,
  abstract     = {Extracting light from silicon is a longstanding challenge in modern engineering and physics. While silicon has underpinned the past 70 years of electronics advancement, a facile tunable and efficient silicon-based light source remains elusive. Here, we experimentally demonstrate the generation of tunable radiation from a one-dimensional, all-silicon nanograting. Light is generated by the spontaneous emission from the interaction of these nanogratings with low-energy free electrons (2–20 keV) and is recorded in the wavelength range of 800–1600 nm, which includes the silicon transparency window. Tunable free-electron-based light generation from nanoscale silicon gratings with efficiencies approaching those from metallic gratings is demonstrated. We theoretically investigate the feasibility of a scalable, compact, all-silicon tunable light source comprised of a silicon Field Emitter Array integrated with a silicon nanograting that emits at telecommunication wavelengths. Our results reveal the prospects of a CMOS-compatible electrically-pumped silicon light source for possible applications in the mid-infrared and telecommunication wavelengths.},
  author       = {Roques-Carmes, Charles and Kooi, Steven E. and Yang, Yi and Massuda, Aviram and Keathley, Phillip D. and Zaidi, Aun and Yang, Yujia and Joannopoulos, John D. and Berggren, Karl K. and Kaminer, Ido and Soljačić, Marin},
  issn         = {2041-1723},
  journal      = {Nature Communications},
  publisher    = {Springer Nature},
  title        = {{Towards integrated tunable all-silicon free-electron light sources}},
  doi          = {10.1038/s41467-019-11070-7},
  volume       = {10},
  year         = {2019},
}