Abstract
A design of tunable terahertz (THz) meta-absorber (TMA) is proposed, which is composed of a periodic Al cross-shaped resonator suspended on bottom Al mirror layer. The electromagnetic responses of TMA can be manipulated between single- and dual-resonance. TMA shows polarization dependent and independent characteristics. Moreover, the flexibility and applicability of TMA are highly improved as it exhibits the linear red-shifting of resonances by increasing the environmental refraction index. The highest sensitivity is 3.05 THz/RIU. This design of tunable TMA provides a useful method for the applications in solar cells, optical switching , imaging, energy harvesting , and high-sensitive sensing in the THz-wave optoelectronics fields. • A design of tunable terahertz (THz) meta-absorber (TMA) is proposed. • The electromagnetic responses can be manipulated between single- and dual-resonance. • TMA shows polarization sensitive characteristic. • TMA exhibits the linear red-shifting of resonances by increasing the environmental refraction index. • TMA shows high sensitivity of 3.05 THz/RIU for ω 2 resonance.
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