Condensed Matter Physics Seminar
Active, Dynamic, and Tunable Metamaterials at Terahertz Frequencies
Department of Physics
The development of artificially structured materials, termed metamaterials (MMs), has dramatically expanded our view of electromagnetic material interactions. These sub-wavelength composites can be designed to exhibit electromagnetic responses allowing for the realization of phenomena not available with natural materials. This is especially important for the technologically relevant terahertz (1 THz = 1012 Hz) frequency regime, since many materials inherently do not respond to THz radiation and thus the tools necessary to construct devices operating within this range -- sources, lenses, switches, modulators, detectors largely do not exist. Considerable efforts are underway to fill this “THz gap” in view of the well-known potential applications using THz radiation. Moderate progress has been made in THz generation and detection and THz quantum cascade lasers are a recent example. However, techniques to control and manipulate THz waves lag far behind. I will show the first active and dynamic MM devices capable of efficient real-time control and manipulation of THz radiation and demonstrate switching occurring on ultrafast time scales, all of which demonstrate considerable advance over the existing state of the art.
Thursday, October 12, 2006
Gant Science Complex
(The seminar is followed by coffee/tea, cookies, and an informal discussions.)