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.

Additional Metadata
Persistent URL
Journal Appl. Phys. Lett.
Kuttge, Martin, Vesseur, Ernst Jan R, & Polman, A. (2009). Fabry-Pérot resonators for surface plasmon polaritons probed by cathodoluminescence. Appl. Phys. Lett., 94(Article number: 183104), 1–3. doi:10.1063/1.3126484