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In-plane focusing of terahertz surface waves on a gradient index metamaterial film

: Volk, M.F.; Reinhard, B.; Neu, J.; Beigang, R.; Rahm, M.


Optics Letters 38 (2013), No.12, pp.2156-2158
ISSN: 0146-9592
Journal Article
Fraunhofer IPM ()

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 m after a focal length of approximately 2 mm. In the focus, we measured a field amplitude enhancement of a factor of 3.