Seojoo Lee, WonTae Kim, Ji-Hun Kang, BongJoo Kang, Fabian Rotermund, Q-Han Park,
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10541/1054122/Giant-phase-retardation-of-terahertz-waves-by-resonant-hyperbolic-metasurface/10.1117/12.2288060.short?SSO=1
Due to the relatively weak birefringence of
natural materials in terahertz regime, metasurfaces have been proposed for
compact terahertz phase modulators since they show effectively strong
birefringence only with ultrathin structures. However, previous designs of
metasurface show limited phase modulation reaching only up to the
quarter-wavelength phase, and there has been no single metasurface design that
works for a terahertz half-waveplate. Here, we present a metasurface that
modulates the phase variably up to 180 degrees. The phase modulation is
achieved by a hyperbolic metasurface composed of periodically arrayed
rectangular metal rings with different periods for horizontal and vertical
axis. By controlling each period, we show that our hyperbolic metasurface can
possess large positive and negative permittivity values for horizontal and
vertical axis and the phase shift can reach up to the 180 degrees. To check the
validity of our design, we fabricate reconfigurable metasurface films and
demonstrate the phase modulation 90 to 180 degrees. All results show good
agreement with numerical simulation results.
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Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for
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