Parallel scanning-optical nanoscopy with optically confined probes.
OPTICS EXPRESS(2010)
摘要
We report the imaging of sub-diffraction limited features using an optical probe generated by focusing a round spot at one wavelength, lambda(1) = 405nm, and a ring-shaped spot at a second wavelength, lambda(2) = 532nm, onto a thin photochromic layer that coats the nanostructures. Illumination at lambda(2) turns the photochromic layer opaque to lambda(1) everywhere except at the centre of the ring, where the illumination at lambda(1) penetrates and probes the underlying nanostructure. We confirm that this optically confined probe increases image contrast and is able to resolve features smaller than the far-field diffraction limit. Furthermore, by using an array of dual-wavelength diffractive microlenses, we demonstrate the feasibility of parallelizing this approach. Compared to previous approaches, our technique is not limited to fluorescence imaging. (C) 2010 Optical Society of America
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关键词
near field microscopy,microscopy,superresolution
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