News & Events

HEPL / KIPAC Seminar

Wednesday, February 5, 2014

Philip L. Marston

Physics and Astronomy Dept., Washington State University

Acoustical and Optical Radiation Force and Scattering Anomalies

Abstract: Recent experiments on the topological charge dependence of radiation torques and on negative radiation forces [Demore et al., Phys. Rev. Lett. 108, 194301 (2012); Brzobohaty et al., Nat. Photonics 7, 123 (2013)] display how the underlying wave-field geometry influences radiation forces. Other situations strongly influenced by wave-field geometry include the introduction of higher order caustics present in the light scattering pattern of objects as simple as an oblate drop of water or an oblate bubble of air in water. Some related theoretical and experimental investigations are illustrated. Scattering enhancements associated with guided waves having negative group velocities will also be noted.

Time: 4:15 – 5:15pm

Location: Physics/Astrophysics Bldg., Kistler Conference Room 102/103 (Map)

(Light refreshments available 4:00pm; Presentation begins 4:15pm)

Open to All