Condensed Matter Physics Seminar

Active, Dynamic, and Tunable Metamaterials at Terahertz Frequencies

Willie J. Padilla
Assistant Professor
Department of Physics
Boston College

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
2:00 pm
Gant Science Complex
Physics Department
Room P121

(The seminar is followed by coffee/tea, cookies, and an informal discussions.)

© 2006 Department of Physics, University of Connecticut
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