Metasurfaces offer unprecedented flexibility in the design and control of light propagation
replacing bulk optical components and exhibiting exotic optical effects. One of the basic properties of the metasurfaces
which renders them as frequency selective surfaces
is the ability to transmit or reflect radiation within a narrow frequency band that can be engineered on demand. Here we introduce and demonstrate experimentally in the THz domain the concept of wavevector selective surfaces – metasurfaces transparent only within a narrow range of light propagation directions operating effectively as tunnel vision filters. Practical implementations of the new concept include applications in wavefront manipulation
observational instruments
vision and free-space communication in light-scattering environments.
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