We present a design of a tunable infrared (IR) resonator by using complementary circular metamaterial (CCM). CCM is composed of concentric rings. It exhibits superior characteristics of narrow multiresonance generated by the coupling between two adjacent concentric rings in the IR wavelength range. An effective modulation of reflection spectra can be realized by changing the height of each concentric ring. By slightly elevating the concentric rings, the corresponding resonances can be switched between on and off states, and the resonances become more sensitive to the surrounding refraction index. The figure of merit (FOM) is 10.91 for CCM exposed on the surrounding environment with different refraction indices. The correlation coefficient is 0.998. The proposed CCM design provides potential applications in refraction index sensors and exhibits the possibility for future multichannel IR switches, environmental sensors, bandpass filters, wavelength-division multiplexing, and so on.

中文翻译：

---

使用互补圆形超材料可调谐的多共振。

我们提出了一种使用互补圆形超材料（CCM）的可调谐红外（IR）谐振器的设计。CCM由同心环组成。它具有红外波长范围内两个相邻同心环之间耦合产生的窄多共振的出色特性。通过改变每个同心环的高度可以实现反射光谱的有效调制。通过稍微升高同心环，可以在开和关状态之间切换相应的共振，并且共振对周围的折射率变得更加敏感。对于暴露在周围环境中具有不同折射率的CCM，品质因数（FOM）为10.91。相关系数为0.998。