An ultra-broadband terahertz absorber at high terahertz frequency

Broadband absorber at high terahertz frequency is highly required for applications in imaging, detecting, electromagnetic stealth. Although intensive investigations of the broadband have been taken, challenges still exist both design and fabrication an ultra-broadband frequency. Herein, a three-layered structure metamaterial has designed to realize covering 3.94–9.98 THz (6.04 THZ) absorption above 80%, bandwidth can be increased 7.64THz (2.34–9.98 THz) by rotating absorber. Upon on simulations, proposed exhibits insensitive TM TE polarization, it means effect almost consistent different polarization modes, significant practical application. Nevertheless, reduces little bit 5.05 (absorption > 60%) as ? increases 45°.