超构材料类电磁感应透明现象的实验研究

基于梳状线和开口谐振环组成的耦合结构,在开口谐振环上加载电阻调节损耗,加载电容使结构达到深亚波长尺度,实现了超构材料类电磁感应透明现象。通过调节梳状线和开口谐振环之间的距离改变近场耦合强度。实验结果表明,随着耦合强度的减小,电磁感应透明频率处的透射率逐渐减小,反射率逐渐增大,吸收率呈现先增大后减小的趋势。与此同时,群延时变大,慢波效应明显,但透明窗口逐渐变窄,慢波带宽变窄。

Electromagnetically Induced Transparency in Metamaterials

Electromagnetically induced transparency(EIT) was studied experimentally in a waveguide system with different coupling strength. A deep-subwavelength EIT element consisting of a comb line and a split-ring resonator was put forward, where the coupling strength was adjusted by changing the distance between the comb line and the split-ring resonator. At the EIT frequency, when the coupling strength becomes weaker, the reflectance is higher, the transmittance is lower and the absorbance is first higher then lower. Weaker coupling creates a narrower transparency window. The slow-wave phenomenon is also observed. The measured group delay time goes up and the slow-wave bandwidth decreases, with the decrease of the coupling strength.