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arXiv · 1304.2556

Diffraction Interference Induced Superfocusing in Nonlinear Talbot Effect

Dongmei Liu·Yong Zhang·Jianming Wen·Zhenhua Chen·Dunzhao Wei·Xiaopeng Hu·Gang Zhao·S. N. Zhu·Min Xiao
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Abstract

We report a simple, novel sub-diffraction method, i.e. diffraction interference induced super-focusing in second-harmonic (SH) Talbot effect, to achieve focusing size of less than λ_pump/8 without involving evanescent waves or sub-wavelength apertures. By tailoring point spread functions with Fresnel diffraction interference, we observe periodic SH sub-diffracted spots over a hundred of micrometers away from the sample. Our demonstration is the first experimental realization of the proposal by Toraldo Di Francia pioneered 60 years ago for super-resolution imaging.

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Dongmei Liu, Yong Zhang, Jianming Wen, Zhenhua Chen, Dunzhao Wei, Xiaopeng Hu, Gang Zhao, S. N. Zhu, Min Xiao. 2013-04-26. Diffraction Interference Induced Superfocusing in Nonlinear Talbot Effect. https://doi.org/10.1038/srep06134

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