We demonstrate that paraxial ring-Airy beams can approach the wavelength limit, while observing a counterintuitive, strong enhancement of their focal peak intensity. Using numerical simulations, we show that this behavior is a result of the coherent constructive action of paraxial and nonparaxial energy flow. A simple theoretical model enables us to predict the parameter range over which this is possible.

中文翻译：

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环形艾里光束在波长极限

我们证明近轴环-艾里光束可以达到波长极限，同时观察到它们的聚焦峰强度有反直觉的，强烈的增强。使用数值模拟，我们表明此行为是近轴和非近轴能量流的相干构造作用的结果。一个简单的理论模型使我们能够预测可能的参数范围。