Journal
APPLIED PHYSICS LETTERS
Volume 87, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1977213
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Time-domain terahertz spectroscopy allows measuring the complex conductivity spectrum of materials at frequencies on the order of 1 THz. Typically, terahertz (THz) studies produce conductivity spectra that are different from those predicted by the classical Drude model, especially in nanostructured materials. We claim that plasmon resonances in particles that are small compared to the THz wavelength cause these deviations. This is supported by measurements on photoexcited silicon, in bulk as well as in micron-sized particles. In the latter, the behavior is vastly different and strongly dependent on charge carrier concentration. (c) 2005 American Institute of Physics.
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