19 February 2013 Optical microscopy with super-resolution by liquid-immersed high-index microspheres
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Abstract
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, Arash Darafsheh, Nicholaos I. Limberopoulos, Nicholaos I. Limberopoulos, John S. Derov, John S. Derov, Dennis E. Walker, Dennis E. Walker, Magdalena Durska, Magdalena Durska, Dimitry N. Krizhanovskii, Dimitry N. Krizhanovskii, David M. Whittaker, David M. Whittaker, Vasily N. Astratov, 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); doi: 10.1117/12.2005896; https://doi.org/10.1117/12.2005896
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