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Proceedings Paper

Optical microscopy with super-resolution by liquid-immersed high-index microspheres
Author(s): Arash Darafsheh; Nicholaos I. Limberopoulos; John S. Derov; Dennis E. Walker; Magdalena Durska; Dimitry N. Krizhanovskii; David M. Whittaker; Vasily N. Astratov
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Paper 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.

Paper Details

Date Published: 19 February 2013
PDF: 7 pages
Proc. SPIE 8594, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications X, 85940C (19 February 2013); doi: 10.1117/12.2005896
Show Author Affiliations
Arash Darafsheh, Univ. of North Carolina at Charlotte (United States)
Nicholaos I. Limberopoulos, Air Force Research Lab. (United States)
John S. Derov, Air Force Research Lab. (United States)
Dennis E. Walker, Air Force Research Lab. (United States)
Magdalena Durska, The Univ. of Sheffield (United Kingdom)
Dimitry N. Krizhanovskii, The Univ. of Sheffield (United Kingdom)
David M. Whittaker, The Univ. of Sheffield (United Kingdom)
Vasily N. Astratov, Univ. of North Carolina at Charlotte (United States)
Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 8594:
Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications X
Alexander N. Cartwright; Dan V. Nicolau, Editor(s)

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