论文标题
基于DIRAC半法的TAMM表面等离子体增强和可控制的反射组延迟
Enhanced and controllable reflected group delay based on Tamm surface plasmons with Dirac semimetals
论文作者
论文摘要
在本文中，从理论上研究了在一维光子晶体（1D PC）上涂有多层半学的反射组延迟，理论上研究了隔层。结果表明，在该结构中反射的梁的组延迟可能会产生负面增强，并且可以从负面转到正。增强的组延迟源于dirac半准层和间隔层之间的界面上的TAMM等离子体的激发引起的陡峭相变。显然，可以通过费米能量和狄拉克半学的放松时间积极调整正组和负群延迟。我们认为，这种增强且可调的延迟方案有望在中间红外频段制造光学延迟设备和其他应用。
In this paper, the reflected group delay from a multilayer structure where Dirac semimetal is coated on one-dimensional photonic crystal (1D PC) separated by a spacer layer is investigated theoretically. It is shown that the group delayof reflected beam in this structure can be significant enhanced negatively and can be switched from negative to positive. The enhanced group delay originates from the steep phase change caused by the excitation of Tamm plasmons at the interface between the Dirac semimetal and spacer layer. It is clear that the positive and negative group delay can be actively tuned through the Fermi energy and the relaxation time of the Dirac semimetal. We believe this enhanced and tunable delay scheme is promising for fabricating optical delay devices and other applications at middle infrared band.
