Mudachathi Renilkumar, Tanaka Takuo
Opt Express. 2019 Sep 16;27(19):26369-26376. doi: 10.1364/OE.27.026369.
We present the design and fabrication of an isotropic broadband perfect light absorber in the near-infrared range using 3D metamaterials with a single resonator in the unit cell. The metamaterial resonator is comprised of a gold conical helix supported on a silicon pillar with back reflector realized on a silicon substrate. Simulations and experiments have demonstrated that the proposed absorber achieves a broad absorption band of more than 3 µm in the 1.5-4.5 µm wavelength range with an average absorbance of more than 90%. The numerical and experimental analyses show that the proposed device can provide both incident angle and polarization independent operations, which further widens the application prospects of our device.
我们展示了一种在近红外范围内使用具有单谐振器的三维超材料的各向同性宽带完美光吸收体的设计与制造。该超材料谐振器由支撑在硅柱上的金锥形螺旋组成，并在硅衬底上实现了背反射器。模拟和实验表明，所提出的吸收体在1.5 - 4.5微米波长范围内实现了超过3微米的宽吸收带，平均吸收率超过90%。数值和实验分析表明，所提出的器件可以提供与入射角和偏振无关的操作，这进一步拓宽了我们器件的应用前景。
