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19 February 2013 Optical microscopy with super-resolution by liquid-immersed high-index microspheres
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We study super-resolution capability of liquid-immersed high refractive index (n~1.9–2.1) barium titanate glass microspheres with diameters from several microns up to hundreds of microns. Imaging is provided in a conventional upright microscope with the spheres placed in a contact position with various semiconductor and metallic nanostructures. Using a commercial Blu-ray disk, we demonstrate an ability to discern 100 nm feature sizes which cannot be resolved by conventional microscopy. Using silver nanowires with diameter about 100 nm, we demonstrate ~1.7 times improvement in spatial resolution compared to conventional diffraction-limited far field microscopy. Using two-dimensional nanoplasmonic arrays, we demonstrate high resolution imaging by using objectives with surprisingly small numerical apertures. The last property is attractive for high-resolution imaging at long working distances. This imaging technique can be used in biomedical microscopy, microfluidics, and nanophotonics applications.
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Arash Darafsheh, Nicholaos I. Limberopoulos, John S. Derov, Dennis E. Walker Jr., Magdalena Durska, Dimitry N. Krizhanovskii, David M. Whittaker, and Vasily N. Astratov "Optical microscopy with super-resolution by liquid-immersed high-index microspheres", Proc. SPIE 8594, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications X, 85940C (19 February 2013);

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