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Chemistry is all around us

It impacts everything we can see, touch, smell and taste. The programs of the Department will prepare you to understand,investigate and apply the principles of chemistry to a wide variety of careers from the study of the environment, to solving criminal cases, to working in a chemically related business, to using chemistry to understand biological systems and processes, to preparing for a career as a research chemist.

For those wishing to prepare for advanced study in chemistry we offer both Master's and Doctoral Programs in all major fields of Chemistry.

Our faculty provide teaching and research expertise in all major areas of Chemistry

The Department offers weekly seminars by faculty from departments throughout the United States and beyond describing the latest advances in their fields.

Weekly Seminar

Departmental Seminars are held in the Van Lente Auditorium (Neckers 240) at 4:00 pm unless otherwise indicated

Prof. Vasily N. Astratov, Department of Physics and Optical Science, University of North Carolina at Chapel Hill, Friday, September 04

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

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).

  Materials Technology Center Seminar Series