Abstract
Received 9 September 2010; published 6 October 2010An efficient frequency conversion scheme of surface-plasmon polariton SPP is proposed for nonlinearplasmonic applications. Lossy coupling wave equations are deduced to describe the interaction among involvedSPP frequency components. The reciprocal vector of a microstructure could partially compensate the SPPwave-vector mismatch through quasiphase matching QPM . As an example, the frequency doubling of SPPover a periodically poled lithium niobate is studied. The high-field concentration of SPP greatly enhanced thesecond-harmonic generation SHG over a short traveling distance. Although the high attenuation of SPPaffects the SHG severely, a long-range SPP SHG is further proposed and investigated, which shows greatefficiency improvement. The applications of QPM SPP frequency conversion are also discussed showing greatpotentials in miniature plasmonic sources and processors.DOI: 10.1103/PhysRevB.82.155107 PACS number s : 73.20.Mf, 42.65.Ky, 78.20.Bh
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