Results in Physics · 2019 · 79 citations · 21 references
Broadband perfect absorption in the terahertz band remains difficult, as most proposed designs achieve high absorption only over narrow bandwidths. This work proposes a simple periodic structure comprising an open‑loop and an unconnected intersection to realize near‑unit absorption across a wide terahertz band. The efficient absorption arises from resonance coupling between the loop and the intersection, as analyzed by resonance‑coupling theory. Simulations demonstrate that for incidence angles below 40°, the structure achieves over 99 % absorption across a bandwidth of up to 2.35 THz centered at 9.6 THz, indicating promising applications in THz couplers, filters, and electromagnetic stealth.
Achieving broadband perfect absorption has always been a challenge for terahertz bands. Many terahertz broadband perfect absorbers have been proposed, but for most of them, bandwidth with an absorption rate greater than 99% is narrow. In this paper, a simple periodic structure consisting of an open-loop and an unconnected intersection is proposed for the near unit absorption of wideband terahertz waves. Simulation results show that when the incidence angle is less than 40°, the bandwidth with an absorption rate of over 99% fluctuates below 2.35 THz with different incident angles, and the central frequency is 9.6 THz. The physical mechanism of efficient absorption is studied by using resonance coupling theory. Our research has broad potential applications in THz coupler, filter, and electromagnetic stealth.
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