Superluminal terahertz pulses
- 1 January 1999
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 24 (1), 25-27
- https://doi.org/10.1364/ol.24.000025
Abstract
In femtosecond terahertz-pulse (T-ray) imaging of metal structures with dimensions of the order of the wavelength, it is observed that the T rays propagate faster than the vacuum speed of light. In the case of apertures this can be understood as a waveguide effect in which superluminal velocities are expected close to the cutoff frequency. However, the effect is also observed close to knife edges and in propagation past thin metal wires.Keywords
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