Abstract
Based on the hydrodynamic theory of an electron gas, we have calculated the second-harmonic generation (SHG) from metal surfaces in various geometric configurations. The SHG of single-boundary surface plasmons coupled using the Kretschmann geometry is ten times larger for gold, copper, and silver, and 100 times larger for aluminum films than the SHG from the bare metal reflectors. The SHG due to long-range surface plasmons in a modified Kretschmann geometry with a very thin metal film sandwiched between two dielectric layers is typically over two orders of magnitude larger than that from the simple Kretschmann geometry. Enhanced SHG is presumed as the thickness of the index-matched liquid layer and the metal films are suitably adjusted because of the resonant interference.
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