Abstract
A theoretical study is presented for parametric compensation of power losses in surface plasmon polaritons (SPPs) along single metal–dielectric interfaces. An optical or near-infrared signal SPP with subwavelength transverse confinement and an idler SPP with 2–3 times longer wavelength are amplified parametrically by a broadside laser pump. Despite the fact that Drude losses are much higher than parametric gain, there is more than tenfold enhancement of the signal SPP propagation length, albeit at a reduced but detectable signal power level. Numerical results are presented for a silver surface interfaced with a polymer/dye or porous silicon layer that allow phase matching of the noncollinear parametric process.
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