表面等离子体激元的二次谐波全光控制
All-optical control of surface plasmons by second-harmonic generation
摘要：
从理论上证明了表面等离子体激元的光控光。这些波的一个简单而紧凑的源是在金属薄膜上穿孔的有限数量的狭缝（均匀间隔）。当金属膜的一侧被偏振光源从相对侧照射时，该系统在金属膜的一侧散射电磁场。此外，高强度光源通过光学非线性在金属led中有效地产生二次谐波和更高频率的光。它示出了如何从一个弱的光束在$λ$波长的狭缝散射的字段的混合，与高强度的$2 λ$光束产生的二次谐波字段，创建一个相消干涉的表面等离子体在两个可能的方向之一的发射从狭缝，而这些沿相反的方向增强。表面等离子体激元的单向发射是由于在$λ$上的不同对称性，无论它们是线性还是非线性产生的。设想一种纳米器件，其可以允许发送在表面等离子体场中编码的数字信息，或者用于构建超窄带宽表面等离子体频率梳。
英文摘要：
Light with light control of surface plasmon polaritons is theoretically demonstrated. A barely simple and compact source of these waves consists in a finite number of slits (evenly spaced) perforating a metal film. The system scatters electromagnetic fields in one side of the metal film when it is illuminated from the opposite side by a polarized light source. High intensity light sources moreover efficiently generate light at second harmonic and higher frequencies in the metal led by optical nonlinearities. It is shown how the mixing of fields scattered by the slits from a weak beam at $λ$ wavelength, with the second harmonic fields generated by a high intensity $2 λ$ beam, creates a destructive interference of surface plasmons in one of the two possible directions of emission from the slits, while these are enhanced along the opposite direction. The unidirectional launching of surface plasmons is due to the different properties of symmetry at $λ$ whether they are linearly or nonlinearly generated. It is envisaged a nanodevice which might allow sending digital information codified in the surface plasmon field or be used to build ultra-narrow bandwidth surface plasmon frequency combs.
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