Abstract
In this work, we experimentally and theoretically demonstrate that oblique metal gratings with optimal tilt angles can become transparent for broadband terahertz waves under normal incidence. Direct imaging is applied to intuitively prove this broadband transparency phenomenon of structured metals. The transparency is insensitive to the grating thickness due to the non-resonance mechanism, and the optimal tilt angle is determined only by the strip width and the grating period. The oblique metal gratings with broadband transparence may have many potential applications, such as transparent conducting panels, white-beam polarizers, and stealth objects.
Highlights
We experimentally and theoretically demonstrate that oblique metal gratings with optimal tilt angles can become transparent for broadband terahertz waves under normal incidence
Free surface electron oscillations driven by the incident wave may excite surface plasmons (SPs)14 or spoof surface plasmons (SSPs) in the long-wavelength regime,15 which can give rise to extraordinary optical transmission (EOT) through structured metals
We will theoretically and experimentally demonstrate that oblique metal gratings with optimal tilt angles can become transparent for broadband terahertz waves under normal incidence
Summary
We experimentally and theoretically demonstrate that oblique metal gratings with optimal tilt angles can become transparent for broadband terahertz waves under normal incidence. Here we instead use oblique metal gratings to achieve normal-incidence broadband transparence for electromagnetic waves in the terahertz (THz) region.
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