Grant J, McCrindle I J H, Li C, Cumming D R S
Opt Lett. 2014 Mar 1;39(5):1227-30. doi: 10.1364/OL.39.001227.
We present the simulation, implementation, and measurement of a multispectral metamaterial absorber (MSMMA) and show that we can realize a simple absorber structure that operates in the mid-IR and terahertz (THz) bands. By embedding an IR metamaterial absorber layer into a standard THz metamaterial absorber stack, a narrowband resonance is induced at a wavelength of 4.3 μm. This resonance is in addition to the THz metamaterial absorption resonance at 109 μm (2.75 THz). We demonstrate the inherent scalability and versatility of our MSMMA by describing a second device whereby the MM-induced IR absorption peak frequency is tuned by varying the IR absorber geometry. Such a MSMMA could be coupled with a suitable sensor and formed into a focal plane array, enabling multispectral imaging.
我们展示了一种多光谱超材料吸收器（MSMMA）的模拟、实现和测量，并表明我们能够实现一种在中红外和太赫兹（THz）波段工作的简单吸收器结构。通过将红外超材料吸收层嵌入标准的太赫兹超材料吸收器堆栈中，在4.3μm波长处诱导出一个窄带共振。该共振是除了在109μm（2.75THz）处的太赫兹超材料吸收共振之外的。我们通过描述第二种器件来展示我们的MSMMA固有的可扩展性和通用性，在该器件中，通过改变红外吸收器的几何形状来调谐由超材料引起的红外吸收峰值频率。这样的MSMMA可以与合适的传感器耦合并形成焦平面阵列，实现多光谱成像。
