基于钒的表面等离子体宽带广角红外光吸收器

Broadband Wide-Angle Surface Plasmon Infrared Absorbers Based on the Vanadium

探讨了基于金属钒亚微米结构的表面等离子体宽带广角红外光吸收器,它由置于表面涂覆介质层的金属钒衬底上方周期性排列的无限长钒条构成。使用有限元方法计算了其吸收谱,当P极化平面电磁波以小角度(小于20°)入射时,吸收率达到98%以上,波长为1.08～1.60μm;当P极化平面波以大角度(小于50°)入射时,吸收率达到98%以上,波长为1.08～1.44μm;当P极化平面波以10°入射时,谐振峰(λ=1.54μm)的吸收率达到99.9%。此外,由于金属钒的熔点很高,基于金属钒的吸收器可用于强光高功率的场合。

The broadband and wide-angle infrared surface plasmon absorber based on the submi- crometer structure of vanadium was discussed, which was composed of periodically vanadium strips arranged on the surface of the metal vanadium substrate coated with a dielectric layer. The absorption spectrum was calculated with the finite element method （FEM）. For the P-polarized plane electromagnetic wave with a small incident angle （less than 20°） , the wavelength range is from 1.08 to 1.60 μm with the absorptivity exceeding 98°. For the P-polarized plane wave with a larger incident angle （less than 50°）, the wavelength range is from 1.08 to 1.44 μm with the absorptivity exceeding 98%. Besides that, for P-polarized plane wave with an incident angle of 10°, the absorptivity exceeds 99.9% with λ = 1.54μm of the resonance peak. In addition, the ab- sorber can be applied in the device with intense incoming light as a result of the extreme high melting point of vanadium.