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 approximately 200 W/cm(2) as electrons with energies in the 20-40 keV range are injected into gold-silica well structures with a lateral size of just a few hundred nanometers.
Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, United Kingdom.
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Adamo
K F
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MacDonald
Y H
YH
Fu
C-M
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Wang
D P
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Tsai
F J García
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de Abajo
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Zheludev