We numerically demonstrate an ultra-broadband plasmonic absorber by applying chromium and titanium in a 3D metamaterial structure. One unit cell of the proposed absorber consists of continuous Cr/SiO₂ multi-layers covered by two Ti nanodisks for exciting multiple magnetic dipole resonances and localized surface plasmon resonance. The optical simulation results show that the average absorption of the plasmonic structure exceeds 98.4% in the wavelength range of 400- % in the wavelength range of 400−4000 nm. The broadband and high absorption benefits from impedance matching between the nanodisks array and the free space in the wavelength range. Through thermal simulation, we also investigated the photothermal heating generation in the plasmonic metamaterial structure. The temperature rise in the proposed structure is approximately 447 K with an incident wavelength of 618 nm and a light flux of 100 W/cm². Due to the ultra-broadband absorbing performance, the presented design has possibilities in the fields of photodetector applications, solar energy harvesting, thermal emitters, and infrared cloaking.

我们通过在3D超材料结构中应用铬和钛，数值地演示了超宽带等离子体吸收器。所提出的吸收器的一个晶胞由连续的Cr / SiO _2组成由两个Ti纳米盘覆盖的多层，用于激发多个磁偶极子共振和局部表面等离子体激元共振。光学模拟结果表明，在400-4000 nm波长范围内，等离子结构在400-％波长范围内的平均吸收率超过98.4％。宽带磁盘和高吸收率得益于纳米磁盘阵列和波长范围内自由空间之间的阻抗匹配。通过热模拟，我们还研究了等离子体超材料结构中的光热发热。所提出的结构中的温度上升约为447 K，入射波长为618 nm，光通量为100 W / cm ²。由于具有超宽带吸收性能，因此所提出的设计在光电探测器应用，太阳能收集，热辐射器和红外隐身领域具有可能性。