Light well: A tunable free-electron light source on a chip
The passage of a free-electron beam through a nanohole in a periodically layered metal-dielectric structure creates a new type of tunable, nanoscale radiation source-a >light well>. In the reported demonstration, tunable light is generated at an intensity of ∼200W/cm2 as electrons with energies in the 20-40keV range are injected into gold-silica well structures with a lateral size of just a few hundred nanometers. © 2009 The American Physical Society. ; The authors from the University of Southampton acknowledge the support of the UK Engineering and Physical Sciences Research Council (EPSRC, Projects No. EP/C511786/1 and No. EP/F012810/1) and the European Union (FP6 Project No. NMP4-2006-016881, ''SPANS''); Those from the National Taiwan University thank the National Science Council of Taiwan (NSC-97- 2120-M-002-013, NSC-97-2112-M-002-023-MY2, and NSC-97-2915-I-002-001) and the EPSRC (EP/F012810/ 1); Professor Garcı´a de Abajo acknowledges the European Union (NMP4-2006-016881) and the Spanish MEC (MAT2007-66050 and Consolider 'NanoLight.es'). ; Peer Reviewed