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Small-Angle Ultra-Narrowband Tunable Mid-Infrared Absorber Composing from Graphene and Dielectric Metamaterials

机译:小角度超窄带可调谐中红外吸收器,由石墨烯和电介质超材料组成

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We report a small-angle ultra-narrowband mid-infrared tunable absorber that uses graphene and dielectric metamaterials. The absorption bandwidth of the absorber at the graphene Fermi level of 0.2 eV is 0.055 nm, and the absorption peaks can be tuned from 5.14803 to 5.1411 μm by changing the graphene Fermi level. Furthermore, the resonance absorption only occurs in the angle range of several degrees. The simulation field distributions show the magnetic resonance and Fabry–Pérot resonance at the resonance absorption peak. The one-dimensional photonic crystals (1DPCs) in this absorber act as a Bragg mirror to efficiently reflect the incidence light. The simulation results also show that the bandwidth can be further narrowed by increasing the resonance cavity length. As a tunable mid-infrared thermal source, this absorber can possess both high temporal coherence and near-collimated angle characteristics, thus providing it with potential applications.
机译:我们报告了一个小角色超窄带中红外可调吸收器,使用石墨烯和介电超材料。 在0.2eV的石墨烯FERMI水平下吸收器的吸收带宽为0.055nm,并且通过改变石墨烯FERMI水平,可以从5.14803到5.1411μm调谐吸收峰。 此外,共振吸收仅发生在几度的角度范围内。 仿真场分布显示振荡吸收峰处的磁共振和法布里 - Pérot共振。 该吸收器中的一维光子晶体(1dpcs)充当布拉格镜,以有效地反映入射光。 仿真结果还表明,通过增加共振腔长度,可以进一步缩小带宽。 作为可调谐的中红外热源,该吸收器可具有高的时间相干性和近准角度特性,从而提供潜在的应用。

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