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Physics:Svitelskiy

Acoustic studies of materials

We use several different methods, such as ultrasound pulse-echo probing, resonant ultrasound spectroscopy, and impact acoustic spectroscopy to explore elastic properties of materials as a function of temperature, electric, and magnetic filelds. Our materials of interest are ferroelectrics, multiferroics, and metallic glasses. The work is done in collaboration with Towson University (Baltimore MD) and National High Magnetic Field Laboratory (Tallahassee FL).

This work received support of the National Science Foundation in the amount of $203,500 (2017 award # 1709282).

Reports and publications:

Presentation given by Robert Mech at the 2019 March Meeting of the American Physical Society

Presentation given by Robert Mech at the 2018 International Mechanical Engineering Congress & Exposition

Robert Mech's Departmental Honor Thesis

Whispering gallery resonators

Term whispering gallery comes from ancient times, when it was referred to the effect occurring in some architectural structures, when a silent sound or a whisper could be heard at a point located over considerable distance from the source. This effect is common to the buildings under large domes, e.g. the Capitol, or cathedrals. Moreover, the whispering galleries are common for any type of waves. I would like to show the results of the whispering gallery studies in optical cavities. In particular, we investigated behavior of suspended in liquids microspheres in the evanescent light of tapered optical fiber.  The fiber was fed with 40 mW light of a laser tunable in 1.2 -1.35 μm.  This small power was sufficient for the resonant capturing and propelling of 20-30 μm large polystyrene spheres with huge speeds of up to 0.5 mm/sec for big, more than 0.2 mm distances.  The observed effect opens up possibility for a new method of sorting particles with unprecedented selectivity that will find use in industry, healthcare, and environmental applications.

This work received support of the National Science Foundation in the amount of $326,000 (2017 award # 1661700).

Reports and publications:

Presentation given by Nathan Jordan at the 2019 March Meeting of the American Physical Society

Presentation given by Alex King and Nathan Jordan at the 2018 International Mechanical Engineering Congress & Exposition

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