Physics colloquium is March 12

Physics will host a colloquium at 4 p.m. Friday, March 12, in 215 Witmer Hall. Graeme Dewar, Physics and Astrophysics, will discuss "Complex Photonic Media: Properties Nature Didn’t Give Us." Coffee and cookies will be served at 3:30 p.m. in 215 Witmer Hall.

In the last decade there has been a surge of interest in man-made metamaterials which have novel interactions with light. In 2000, Smith et al. made an artificial material which had low loss and exhibited a negative index of refraction - the crests of the light waves moved in the direction opposite to the energy flow. This breakthrough sprung from previous work on photonic crystals and has led to subsequent experiments on “cloaking” or hiding of a finite volume or the universe from passing light rays. Dr. Dewar will describe some of the metamaterials recently fabricated and proposed, highlight the novel properties these media have, and show how an effective permittivity and permeability can be incorporated into Maxwell’s Equations to describe some of these properties.
-- Connie Cicha, Administrative Secretary, Physics & Astrophysics,, 777-2911