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Physical Review B
The surface plasmon polariton ͑SPP͒ field intensity in the vicinity of gratings patterned in an otherwise planar gold surface is spatially resolved using cathodoluminescence ͑CL͒. 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 electrondoi:10.1103/physrevb.79.113405 fatcat:n55dl5b2uzgchgbivh5kfaflqm