Renger Jan, Quidant Romain, Novotny Lukas
ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain.
Opt Express. 2011 Jan 31;19(3):1777-85. doi: 10.1364/OE.19.001777.
While metals benefit from a strong nonlinearity at optical frequencies, its practical exploitation is limited by the weak penetration of the electric field within the metal and the screening by the surface charges. It is shown here that this limitation can be bypassed by depositing a thin dielectric layer on the metal surface or, alternatively, using a thin metal film. This strategy enables us to enhance four-wave mixing in metals by up to four orders of magnitude.
虽然金属在光频下具有很强的非线性特性，但由于金属内部电场穿透能力较弱以及表面电荷的屏蔽作用，其实际应用受到了限制。本文表明，通过在金属表面沉积一层薄介电层，或者使用薄金属膜，可以绕过这一限制。这种策略使我们能够将金属中的四波混频增强多达四个数量级。
