开口环谐振器的非线性特性
Nonlinear properties of split-ring resonators
摘要：
本文对高Q值电容和非线性变容管加载的开口环谐振器的特性进行了理论分析和实验测量。我们证明了非线性SRR的谐振频率$f_m$可以通过增加入射功率来调节。对于加载一个变容二极管和两个背靠背变容二极管的SRR，$f_m$分别移动到较低和较高频率。对于高入射功率，我们观察到可调谐的超材料和滞后效应。此外，还讨论了两个非线性谐振环之间的耦合问题。
英文摘要：
In this letter, the properties of split-ring resonators (SRRs) loaded with high-Q capacitors and nonlinear varactors are theoretically analyzed and experimentally measured. We demonstrate that the resonance frequency $f_m$ of the nonlinear SRRs can be tuned by increasing the incident power. $f_m$ moves to lower and higher frequencies for the SRR loaded with one varactor and two back-to-back varactors, respectively. For high incident powers, we observe bistable tunable metamaterials and hysteresis effects. Moreover, the coupling between two nonlinear SRRs is also discussed.
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