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.
| Original language | English |
|---|---|
| Pages (from-to) | 25-27 |
| Number of pages | 2 |
| Journal | Optics Letters |
| Volume | 24 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Jan 1999 |
Keywords
- femtosecond terahertz-pulse
- T-ray
- metal structures
- wavelength
- speed of light
- superluminal velocities