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Subdiffraction Focusing Enabled by a Fano Resonance

机译:由fano谐振使能的Subdiffraction焦点

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Radiationless electromagnetic interference (REI) has been used to achieve focusing below Abbe’s diffraction limit. Here, we demonstrate an approach to REI that uses the Fano resonance of subwavelength slits to achieve subdiffraction focusing. Two main features of the Fano resonance are critical: (1)?The Fano resonance suppresses radiation by destructive interference, thereby allowing for REI, and (2)?the Fano resonance creates a resonant field enhancement allowing one to overcome evanescent decay, which is different from past approaches to REI. An analytic theory is introduced to explain these results. While the analytic theory is formulated for a perfect electric conductor, comprehensive numerical simulations show the applicability in the visible regime, where losses and plasmonic effects play a role.
机译:辐射电磁干扰(REI)已被用于实现在ABBE的衍射极限下方的关注。在这里,我们展示了一种对使用副波长狭缝的FANO共振来实现Subdiffraction聚焦的方法。 Fano谐振的两个主要特征是关键的:(1)?Fano谐振通过破坏性干扰抑制辐射,从而允许REI和(2)?扇形谐振产生允许一个克服渐逝衰变的谐振场增强,这是克服渐变的衰变与REI的过去的方法不同。介绍了分析理论来解释这些结果。虽然分析理论被配制为完美的电导体,但综合数值模拟显示了可见制度的适用性,损失和等离子体效应发挥作用。

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