MSE Colloquium - Dr. Ildar Salakhutdinov
Date: February 23, 2012 from 1:00 pm to 2:00 pm EST
Location: Room 214, S.W. Mudd
Contact: For further information regarding this event, please contact Wesley Hattan by sending email to or by calling 2128547860.
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Ildar Salakhutdinov
Columbia University

"Negative Refractive Index Materials: Interpretation Problems"

In this seminar several issues which arise during experiments showing "negative refractive index" in metamaterials will be discussed. It will be shown that one does not really need to invoke "negative refractive indices" to explain these results. An alternative interpretation will be presented which takes into account three well known phenomena:

1) The fact that Fresnel reflection is caused by step of impedance, not step of phase velocity;

2) Bragg diffraction is possible for almost any periodic structure;

3) In highly dispersive media resonances can results from presence of different guided modes in such media.