Propagating Dirac plasmon polaritons in topological insulators
Propagating Dirac plasmon polaritons in topological insulators
复制标题
在拓扑绝缘体中传播狄拉克等离子体激元
DOI：
10.1088/2040-8986/abc315
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发表时间：
2020
影响因子：
2.1
通讯作者：
Law, Stephanie
中科院分区：
文献类型：
--
作者：
Wang, Yong;Law, Stephanie
研究了拓扑绝缘体薄膜中传播的狄拉克等离子体激元的激发。采用分子束外延技术生长了一系列TI薄膜。在TI薄膜上制作了不同周期的周期金光栅耦合器，用于激发传播的DPP。在傅里叶变换红外光谱透射扫描中观察到一系列随光栅周期性移动的吸收峰。我们已经排除了任何来源以外的激发传播的DPP，可能会导致峰值出现。峰值色散与TI薄膜中耦合DPP的理论预测一致。
We investigate the excitation of propagating Dirac plasmon polaritons (DPPs) in topological insulator (TI) thin films. A series of TI thin films were grown by molecular beam epitaxy. Periodic gold grating couplers with different periodicity were fabricated on the TI films to excite the propagating DPPs. A series of absorption peaks that shift with the grating periodicity were observed in Fourier transform infrared spectroscopy transmission scans. We have ruled out any source other than the excitation of propagating DPPs that could have caused the peaks to appear. The peak dispersion is consistent with theoretical predictions for coupled DPPs in TI thin films.