Department of Physics, Engineering Physics & Astronomy

Queen's University
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Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

What Can 1012 Hz Light Tell Us About 10-9 m Physics?

David G. Cooke
Department of Physics, McGill University

Thursday, November 1, 2012
10:30 AM @ Stirling 501

Abstract:

In this talk I will outline how the recent development of single-cycle bursts of far-infrared light, called THz (1012 Hz) pulses, can be used to probe nanometer scale charge carrier motion in semiconductors and their nanostructures. We will begin with the methods of THz generation and detection, which have evolved significantly in recent years, and focus on the technique of time-resolved THz spectroscopy where very low energy (meV) photoexcitations in condensed matter can be resolved with femtosecond resolution. We will discuss measurements on quantum wires, dots, nanocrystals and organic polymer bulk heterojunctions, the active materials inside plastic solar cells, and show how THz pulses can be used to track the motion of charges in nanoscale environments immediately after their "birth".