Diffraction Interference Induced Superfocusing in Nonlinear Talbot Effect

نویسندگان

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

We report a simple, novel subdiffraction method, i.e. diffraction interference induced superfocusing in second-harmonic (SH) Talbot effect, to achieve focusing size of less than λSH/4 (or λpump/8) without involving evanescent waves or subwavelength apertures. By tailoring point spread functions with Fresnel diffraction interference, we observe periodic SH subdiffracted spots over a hundred of micrometers away from the sample. Our demonstration is the first experimental realization of the Toraldo di Francia's proposal pioneered 62 years ago for superresolution imaging.

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عنوان ژورنال:

دوره 4  شماره 

صفحات  -

تاریخ انتشار 2014