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超振荡及其远场聚焦成像研究进展?
Progress in far-field fo cusing and imaging with sup er-oscillation
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摘要: 带限函数在某区间内的振荡速度超过其最高傅里叶分量的特殊性质被称为超振荡。基于超振荡原理的微纳光子学器件可在不依赖倏逝波条件下于远场处突破衍射极限，因此在超分辨成像、纳米光刻及高密度光存储等领域具有重要应用。简要介绍了超振荡原理，重点归纳了几种超振荡微结构器件的设计及其聚焦成像性能，并指出了这些器件的不足及未来的研究重点。Abstract: Superoscillation is known as a counter-intuitive property of a band-limited function that oscillates faster than its highest Fourier component in a prescribed interval. Based on superoscillation, micro/nano optical devices, breaking through the diffraction limit in the far-field independent of evanescent waves, have potential applications, including super-resolution, nano-photolithography, high-density optical storage, etc. In this paper, superoscillation is introduced simply, and several optical superoscillatory designs with focusing and imaging abilities are summarized primarily, and some defects and future research emphases in these designs are pointed out.
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