The dual annihilation of a surface plasmon and a photon by virtue of a three-wave mixing interaction.
The dual annihilation of a surface plasmon and a photon by virtue of a three-wave mixing interaction.
复制标题
通过三波混合相互作用实现表面等离子体激元和光子的双重湮灭。
作者：
J. Heckmann;Marie;N. Grosse;U. Woggon
由表面等离子体共振驱动的增强的非线性相互作用很容易被用于金属结构中的光学频率转换。然而，到目前为止，几乎没有人注意到转化过程的确切颗粒性。我们证明了表面等离子体激元和光子可以同时湮灭，从而产生具有和频率的光子。通过对Kretschmann几何中的金膜应用双光束k-空间光谱方法来探索动量守恒条件，揭示了这种非线性相互作用的特征。观察到的非线性相互作用的逆--一种奇异的参数下转换形式--将作为近场表面等离子体的来源，这些表面等离子体与远场中的光子相关联。
The enhanced nonlinear interactions that are driven by surface-plasmon resonances have readily been exploited for the purpose of optical frequency conversion in metallic structures. As of yet, however, little attention has been payed to the exact particulate nature of the conversion process. We show evidence that a surface plasmon and photon can annihilate simultaneously to generate a photon having the sum frequency. The signature for this nonlinear interaction is revealed by probing the condition for momentum conservation using a two-beam k-space spectroscopic method that is applied to a gold film in the Kretschmann geometry. The inverse of the observed nonlinear interaction-an exotic form of parametric down-conversion-would act as a source of surface plasmons in the near-field that are quantum correlated with photons in the far-field.