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arXiv physics/0602133physics.optics
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在亚波长尺度上控制强电磁场

Controlling Strong Electromagnetic Fields at a Sub-Wavelength Scale

J. Le Perchec, P. Quemerais, A. Barbara, T. Lopez-Rios

摘要:

我们研究了金属屏幕上两个亚波长凹槽的光学响应,两个亚波长凹槽相隔一段亚波长距离。我们表明,法布里-珀罗模式,已经观察到在一维周期性光栅和已知的单缝,分裂成两个共振在我们的系统中:一个对称的模式与一个小的Q-因子,反对称的一个,导致更强的光增强。这种行为的结果从近场耦合的凹槽。此外,第二入射波的使用允许根据两个入射波之间的相位差来控制光子在我们选择的凹槽中的定位。该系统实际上是一个远场操作的亚波长光开关。

英文摘要:

We investigate the optical response of two sub-wavelength grooves on a metallic screen, separated by a sub-wavelength distance. We show that the Fabry-Perot-like mode, already observed in one-dimensional periodic gratings and known for a single slit, splits into two resonances in our system : a symmetrical mode with a small Q-factor, and an antisymmetric one which leads to a much stronger light enhancement. This behavior results from the near-field coupling of the grooves. Moreover, the use of a second incident wave allows to control the localization of the photons in the groove of our choice, depending on the phase difference between the two incident waves. The system exactly acts as a sub-wavelength optical switch operated from far-field.

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