Department of Physics

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Thesis Seminar Announcement

Apr 28, 2011

*****Thesis Seminar Announcement*****

Tuesday, May 3, 2:00 pm
Currens Hall 206
All physics faculty and students are invited.

Speaker: Jacob Brown
Graduate Student, Physics Department, WIU

Title: "Orbital Angular Momentum of Light in the Radio Range of the Electromagnetic Spectrum"


It has been recently found that light, which is a wave, has a property called orbital angular momentum that has been well-known to exist for particulate matter--say a planet rotating around the Sun or an electron orbiting around its nucleus. It turns out that each photon in the light beam carrying OAM has a specific quantum angular momentum say l'. Such a light beam has l azimuthal phase singularities across a cut taken in the beam path. The sign of l corresponds to the sense of rotations of the phase fronts around the beam axis. Knowing these properties of the light carrying OAM several detection schemes have been developed but not all are conducive to detection of OAM coming from astrophysical objects.
In this presentation, I will summarize my work in generation and detection of light beams carrying OAM in the radio range of the electromagnetic spectrum. Such detection techniques will allow detailed dynamical study of the rotation of the astrophysical objects emitting OAM of light. It may as well open up new methods for high-bandwidth radio communication techniques and may throw some light on natural ways of generation of light carrying OAM.

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