Superresolution imaging via superoscillation focusing of a radially polarized beam

Yuichi Kozawa, Daichi Matsunaga, Shunichi Sato

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

The phenomenon of superoscillation produces oscillations that are faster than the fastest Fourier component of a system, potentially forming a local “hot spot” with a size below the diffraction limit. We show that a radially polarized Laguerre–Gaussian mode has the inherent ability to form superoscillation spots simply by controlling the incident beam size. We investigate this in detail, both numerically and experimentally. Our numerical simulations predict that lateral resolutions close to 100 nm are possible for practical confocal laser scanning microscopy with visible light. We demonstrate experimentally that superoscillation focusing can offer significant spatial resolution improvements for fluorescence imaging.

Original languageEnglish
Article number2334-2536/18/020086-07
Pages (from-to)86-92
Number of pages7
JournalOptica
Volume5
Issue number2
DOIs
Publication statusPublished - 2018 Feb 20

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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