Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffraction Interference Induced Superfocusing in Nonlinear Talbot
  Effect   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 {\lambda}_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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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph