Morsy Ahmed M, Povinelli Michelle L
Opt Express. 2021 Feb 15;29(4):5840-5847. doi: 10.1364/OE.414713.
We study the absorptivity of coupled metamaterial resonators in the mid-infrared range. We consider resonators supporting either a bright mode or a dark mode, introducing an additional degree of freedom for spectral modulation relative to bright modes alone. In a dark-bright coupled resonator system, we demonstrate tunable spectral splitting by changing the separation between resonators. We show via coupled mode theory that resonator separation can be mapped to coupling constant. We further introduce a dark-dark coupled resonator system, which gives rise to an emissive bright mode only in the presence of inter-resonator coupling. The dark-dark system yields a broadband emissivity that decays to zero exponentially with resonator separation, providing a design method for strong thermal emissivity control.
我们研究了耦合超材料谐振器在中红外波段的吸收率。我们考虑了支持亮模或暗模的谐振器，相对于仅亮模而言，引入了用于光谱调制的额外自由度。在暗 - 亮耦合谐振器系统中，我们通过改变谐振器之间的间距来演示可调谐光谱分裂。我们通过耦合模理论表明，谐振器间距可以映射到耦合常数。我们进一步引入了暗 - 暗耦合谐振器系统，该系统仅在存在谐振器间耦合时才产生一个发射亮模。暗 - 暗系统产生宽带发射率，该发射率随着谐振器间距呈指数衰减至零，为强热发射率控制提供了一种设计方法。
