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Kuzmin, N.V. (author), Alkemade, P.F.A. (author), 't Hooft, G.W. (author), Elie, E.R. (author)Employing an interferometric cavity ring-down technique we study the launching, propagation and reflection of surface plasmons on a smooth gold-air interface that is intersected by two parallel, subwavelength wide slits. Inside the low-finesse optical cavity defined by these slits the surface plasmon is observed to make multiple bounces. Our...journal article 2007