CfM Researchers highlighted in Annalen der Physik

CfM Researchers highlighted in Annalen der Physik

Congratulations to the CfM Researchers highlighted in Annalen der Physik.  Published in August 2015 Dr. Vasily Astratov along with his recently graduated students and Center collaborators were featured in the highlighted section of Annalen der Physik along side Stefan Hell's Nobel lecture: Nanoscopy with focused light. 

Super-resolution microscopy by movable thin-flms with embedded microspheres: Resolution analysis

Kenneth W. Allen, Navid Farahi, Yangcheng Li, Nicholaos I. Limberopoulos, Dennis E.Walker Jr., Augustine M. Urbas, Vladimir Liberman, and Vasily N. Astratov

Volume 527 Issue 7-8 Pages 513-522 (2015)

DOI: 10.1002/andp.201500194

     Microsphere-assisted imaging has emerged as an extraordinary simple technique of obtaining optical super-resolution. This work addresses two central problems in developing this technology: i) methodology of the resolution measurements and ii) limited field-of-view provided by each sphere. It is suggested that a standard method of resolution analysis in far-field microscopy based on convolution with the point-spread function can be extended into the super-resolution area. This allows developing a unified approach to resolution measurements, which can be used for comparing results obtained by different techniques. To develop the surface scanning functionality, the high-index (n ∼ 2) barium titanate glass microspheres were embedded in polydimethylsiloxane (PDMS) thin-films. It is shown that such films adhere to the surface of nanoplasmonic structures so that the tips of embedded spheres experience the objects’ optical near-fields. Based on rigorous criteria, the resolution ∼λ/6-λ/7 (where λ is the illumination wavelength) is demonstrated for arrays of Au dimers and bowties. Such films can be translated along the surface of investigated samples after liquid lubrication. It is shown that just after lubrication the resolution is diffraction limited, however the super-resolution gradually recovers as the lubricant evaporates.

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