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Jelenlegi hely

2015. július 10. péntek 11 óra

Időpont: 2015. július 10., péntek. 11 óra

Helyszín Budó Ágoston tanterem

Előadó: Dr. Vasily N. Astratov, Department of Physics and Optical Science,
University of North Carolina at Charlotte

Cím: Microspherical Photonics: Optical Super-Resolution and Resonant
Propulsion Effects

 

Microspherical Photonics: Optical Super-Resolution and Resonant Propulsion Effects

Vasily Astratov

Department of Physics and Optical Science

University of North Carolina at Charlotte

Abstract

Emerging microspherical photonics is based on two recently observed effects in the optical properties of dielectric microspheres – super-resolution imaging and resonant propulsion. The physical mechanisms of optical super-resolution are debated in the literature and can involve excitation of plasmon resonances in nanostructured metallic objects coupled to microspherical dielectric antennas. We developed a methodology of experimental definition of super-resolution and demonstrated ~l/7 resolution of nanoplasmonic arrays [1]. We observed a resonant enhancement of the optical forces exerted on microspheres in evanescent fiber couplers. It is shown that the magnitude of the optical forces is determined by almost complete light momentum transfer to microspheres under resonance with their whispering gallery modes [2]. This can lead to sorting of spherical photonic atoms with identical resonant properties for a variety of applications [3].

[1] A. Darafsheh, N.I. Limberopoulos, J.S. Derov, D.E. Walker, Jr., and V.N. Astratov, APL 104, 061117 (2014)

[2] Y. Li, A.V. Maslov, N.I. Limberopoulos, A.M. Urbas, and V.N. Astratov, Laser & Phot. Rev. 9, 263 (2015).

[3] A.V. Maslov and V.N. Astratov, APL 105, 121113 (2014).

 

Bio

Vasily N. Astratov is a professor in the Department of Physics and Optical Science at the University of North Carolina-Charlotte. In 1986, he received his Ph.D. degree from the A.F. Ioffe Physical-Technical Institute, St. Petersburg. In the mid-90s, he pioneered studies of synthetic opals as novel self-assembled photonic crystals for visible light in his group at the Ioffe Institute. In 1997-2001, he was a postdoctoral scholar at the University of Sheffield. He joined UNC-Charlotte in 2002. His current research is devoted to microspherical photonics including super-resolution and optical manipulation with microspheres. He was a topical editor for the journal Optics Express in 2005-2011 and served as a technical committee member for major international conferences including CLEO, IPC, ICTON and OECC/ACOFT. He is a recipient of a number of awards including International Visitor Award in France by Triangle de la Physique in 2011, Senior Visiting EPSRC Fellow Award in the UK in 2006, and Award of the Exchange Program adopted between Royal Society and Russian Academy of Sciences in 1996.