零折射率材料微腔中类多原子与腔模的相干耦合

Coherent Coupling of Multi-oscillators with Cavities Filled with Zero-index Metamaterials

量子点与微腔之间的耦合强度大小对于实现各种腔量子电动力学现象,起着至关重要的作用.然而,由于量子点的选择有限性以及其在传统微腔中的位置不确定性,难以实现耦合强度的增强.在本文中,我们构造了一个填充零折射率材料的不寻常腔,其中场强的分布是均匀的.由于这种特殊的场分布,当将谐振强度为G=G0的N个谐振子随机分布在腔中时,每个谐振子均处在场强最大值处,即耦合强度相同,这样N个谐振子相当于一个具有谐振强度为NG0的谐振子,从而达到了谐振强度可调的目的.最后,我们利用类人造原子(金属开口谐振环)与零折射率材料微腔(一维复合左右手传输线)之间的耦合,从微波实验的角度验证了上述结论是正确的.这种可调节的耦合强度可能会对解决腔量子电动力学中量子点和腔模耦合强度不高的问题有一定的指导作用.

In various cavity quantum electrodynamics phenomena, the coupling strength between cavities and quantum dots （QDs） plays a very important role. However, due to the limited choice of QDs and the posi- tional uncertainty brought by the traditional cavity modes, it is difficult to enhance the coupling strength. In this paper, we construct an unusual cavity filled with zero-index metamaterials （ZIM） , where the enhanced field dis- tribution is uniform. Because of the special field character, N oscillators with oscillating strength G = GO are ran- domly distributed into the cavity. Each oscillator can couple to the field maximum and the N oscillators are equiv- alent to one oscillator with effective NGo. Both simulation and experiment demonstrate the adjustable coupling strength just by adding the number of QDs in ZIM-filled cavities.