Fabry–Pérot resonators for surface plasmon polaritons probed by cathodoluminescence

Kuttge, M.; Vesseur, E. J. R.; Polman, A.
May 2009
Applied Physics Letters;5/4/2009, Vol. 94 Issue 18, p183104
Academic Journal
Surface plasmon polariton Fabry–Pérot resonators were made in single-crystalline gold by focused ion beam milling of two parallel 100 nm deep grooves. The plasmonic cavity modes were spatially and spectrally resolved using cathodoluminescence spectroscopy. Mode numbers up to n=10 were observed. The cavity quality factor Q depends strongly on groove depth; the highest Q=21 was found for groove depth of 100 nm at λ=690 nm. The data are consistent with finite-difference time domain calculations that show that the wavelength of maximum reflectivity is strongly correlated with groove depth.


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