Dr. Craig Snoeyink

Over Under Around and Through: Particle Localization and Velocimetry Below the Diffraction Limit

April 28, 2022 | 3:30 P.M. | 112 O'Brian Hall

Assistant Professor, Mechanical and Aerospace Engineering, University at Buffalo


The diffraction limit obscures our view of objects and features below about200 nm. This limits our ability to study relevant particle and fluidic phenomena at the nanoscale which may have velocity gradients or densities which vary strongly over 100 nm. Particle tracking/localization techniques have by passed the diffraction limit, giving resolutions as low as 10 nm, but have difficulty localizing particles in densely seeded systems. This presentation describes Bessel Beam Microscopy, an optical technique that uses Bessel Beams in the imaging path to create an afocal imaging system. This system can be used to produce high resolution (<5nm) localization in dense system as well as the unique capability of actually changing the diffraction limit to approximately 120 nm.


Craig Snoeyink, PhD, is an Assistant Professor in the Department of Mechanicaland Aerospace Engineering at the University at Buffalo. He is an experimentalist developing novel optical microscopy techniques to study nanoscale fluidic and particle phenomena with a particular interest in applying these measurement techniques to study nanofluid detergents and the effects of high electric fields on liquids. His research has been funded by the NSF and NIH and published in a range of journals, including Optics Letters and Langmuir.

Event Date: April 28, 2022 at 3:30 PM