Kuttge, M. and Vesseur, E. J. R. and Koenderink, A. F. and Lezec, H. J. and Atwater, H. A. and García de Abajo, F. J. and Polman, A. (2009) Local density of states, spectrum, and far-field interference of surface plasmon polaritons probed by cathodoluminescence. Physical Review B, 79 (11). p. 113405. ISSN 0163-1829 http://resolver.caltech.edu/CaltechAUTHORS:20090529-090009838
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The surface plasmon polariton (SPP) field intensity in the vicinity of gratings patterned in an otherwise planar gold surface is spatially resolved using cathodoluminescence (CL). A detailed theoretical analysis is presented that successfully explains the measured CL signal based upon interference of transition radiation directly generated by electron impact and SPPs launched by the electron and outcoupled by the grating. The measured spectral dependence of the SPP yield per incoming electron is in excellent agreement with rigorous electromagnetic calculations. The CL emission is shown to be similar to that of a dipole oriented perpendicular to the surface and situated at the point of electron impact, which allows us to establish a solid connection between the CL signal and the photonic local density of states associated to the SPPs.
|Additional Information:||© 2009 The American Physical Society. Received 15 October 2008; published 17 March 2009. This work is part of the research program of FOM, which is financially supported by NWO. This work is also funded by NANONED. Work at Caltech is financially supported by the AFOSR under MURI with Grant No. FA9550-04-1-0434. F.J.G.A. acknowledges support from the Spanish MEC (Contract No. MAT2007-66050).|
|Subject Keywords:||cathodoluminescence; electron collisions; electronic density of states; gold; photonic band gap; polaritons; surface plasmons|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||14 Aug 2009 16:54|
|Last Modified:||26 Dec 2012 11:02|
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