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Fundamental limits of super-resolution microscopy by dielectric microspheres and microfibers

Author(s)
Astratov, V. N.; Maslov, A. V.; Allen, K. W.; Farahi, N.; Li, Y.; Brettin, A.; Limberopoulos, N. I.; Walker, D. E.; Urbas, A. M.; Liberman, Vladimir; Rothschild, Mordechai; ... Show more Show less
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Abstract
In recent years, optical super-resolution by microspheres and microfibers emerged as a new paradigm in nanoscale label-free and fluorescence imaging. However, the mechanisms of such imaging are still not completely understood and the resolution values are debated. In this work, the fundamental limits of super-resolution imaging by high-index barium-titanate microspheres and silica microfibers are studied using nanoplasmonic arrays made from Au and Al. A rigorous resolution analysis is developed based on the object's convolution with the point-spread function that has width well below the conventional (∼λ/2) diffraction limit, where λ is the illumination wavelength. A resolution of ∼λ/6-λ/7 is demonstrated for imaging nanoplasmonic arrays by microspheres. Similar resolution was demonstrated for microfibers in the direction perpendicular to the fiber axis with hundreds of times larger field-of-view in comparison to microspheres. Using numerical solution of Maxwell's equations, it is shown that extraordinary close point objects can be resolved in the far field, if they oscillate out of phase. Possible super-resolution using resonant excitation of whispering gallery modes is also studied. Keywords: Optical super-resolution; near-field microscopy; confocal microscopy
Date issued
2016-04
URI
http://hdl.handle.net/1721.1/115076
Department
Lincoln Laboratory
Journal
Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIII
Publisher
SPIE
Citation
Astratov, V. N., et al. “Fundamental Limits of Super-Resolution Microscopy by Dielectric Microspheres and Microfibers.” Edited by Alexander N. Cartwright, Dan V. Nicolau, and Dror Fixler. Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIII, February 2016, San Francisco, California, USA, SPIE, April 2016 © 2016 SPIE
Version: Final published version
ISSN
0277-786X
1996-756X

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