In-plane focusing of terahertz surface waves on a gradient index metamaterial film.
We designed and implemented a gradient index metasurface for in-plane focusing of confined terahertz (THz) surface waves. We measured the spatial propagation of the surface waves by two-dimensional mapping of the complex electric field using a THz near-field spectroscope. The surface waves were focused to a diameter of 500 μm after a focal length of approximately 2 mm. In the focus, we measured a field amplitude enhancement of a factor of 3.
Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Kaiserslautern, Germany.
Martin F
MF
Volk
Benjamin
B
Reinhard
Jens
J
Neu
René
R
Beigang
Marco
M
Rahm