Abstract
The fluorescence excitation field by photonic nanojet has been investigated, where a SiO 2 microsphere is illuminated by the radial polarized beam. We show that radial polarization illumination can achieve very strong three-dimensional confinement of photonic nanojet below the diffraction limit, especially the longitudinal light field. It is also noted that the location of maximum excitation field intensity spot is not almost change by wavelength, but the volume of excitation field is depended on wavelength. Compared to single-photon excitation, two-photon excitation based on photonic nanojet can obtain the least illumination volume, with lateral FWHM ≈ λ/4 and axial FWHM < λ/10. This offers a broad range of application in single-molecule detection, ultra-resolution microscopy and nanopatterning.
Published Version
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