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June 2021: Poincaré Webinar Series on Optical Polarization and Related Phenomena: "Acoustic Orbital Angular Momentum" by Miles Padgett
Monthly speakers explore topics derived from Henri Poincaré’s work on optical polarization and demonstrate applications of polarization techniques. This month's title is Defining optimality for channeled polarimetry with presenter Miles Padgett.

Join the series’ chairs and moderators – Thomas A. Germer, National Institute of Standards and Technology (USA); Jessica C. Ramella-Roman, Florida International University (USA); and Tatiana Novikova, École Polytechnique (France) – and be part of the discussion.

Tuesday, 29 June 2021, 6:00 am PT (1300 UTC): Acoustic Orbital Angular Momentum
Speaker: Miles Padgett
University of Glasgow (Scotland)

Abstract: Within optics we are familiar with the concept that circular polarization of the transverse field is linked to the spin angular momentum of the light. Sound in air is a longitudinal wave but despite the fact that it has no polarization it can still carry angular momentum. This angular momentum is the orbital angular momentum that has also been recognized in light. I will show experimental work where this acoustic angular momentum can be transferred to matter and where the Doppler shift can be made so large as to make the frequency in the lab frame negative, opening new windows into relativistic effects.

By registering, I agree that SPIE may send me relevant communications via email. This online event will be recorded. I agree to have video, audio, and public text chat recorded as part of the session in the archive. SPIE's Virtual Events operate under a Code of Conduct and I agree to abide by these policies: https://www.spiedigitallibrary.org/commenting-policy

Jun 29, 2021 06:00 AM in Pacific Time (US and Canada)

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By registering, I agree that SPIE may send me relevant communications via email. This online event will be recorded. I agree to have video, audio, and public text chat recorded as part of the session in the archive. SPIE's Virtual Events operate under a Code of Conduct and I agree to abide by these policies: https://www.spiedigitallibrary.org/commenting-policy

Speakers

Miles Padgett, University of Glasgo (Scotland)
Tuesday, 29 June 2021, 6:00 am PT (1300 UTC): Acoustic Orbital Angular Momentum
Miles Padgett is a Royal Society Research Professor and also holds the Kelvin Chair of Natural Philosophy in the School of Physics and Astronomy at the University of Glasgow, UK. His research team, covers all things optical from the basic ways in which light behaves as it pushes and twists the world around us, to the application of new optical techniques in imaging and sensing. They are currently using the classical and quantum properties of light to explore: the laws of quantum physics in accelerating frames, microscopes that see through noise, shaped light that overcomes diffraction-limited resolution, endoscopes the width of a human hair and new ways of imaging in 3D. He is a Fellow both of the Royal Society of Edinburgh and the Royal Society, in addition to various subject specific societies. He has won a number of national and international prizes and has been named by Web of Science as a globally highly-cited researcher two years in a row.