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arXiv 2203.05938physics.opticsquant-ph
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基于狄拉克半金属Tamm表面等离子体的增强可控反射群延迟

Enhanced and controllable reflected group delay based on Tamm surface plasmons with Dirac semimetals

Qiwen Zheng, Wenguang Lu, Shenping Wang, Xinmin Zhao, Leyong Jiang

AI总结:

该研究理论探究了狄拉克半金属-间隔层-一维光子晶体多层结构的反射群延迟,发现Tamm等离子体激发可实现群延迟负向增强及正负切换,且能通过费米能、弛豫时间调控,为中红外光学延迟器件等应用提供了新方案。

摘要:

本文对由一维光子晶体(1D PC)经间隔层分隔后表面涂覆狄拉克半金属的多层结构的反射群延迟开展了理论研究。研究表明,该结构中反射光束的群延迟可实现显著的负向增强,且能从负向切换为正向。增强的群延迟源于狄拉克半金属与间隔层界面处Tamm等离子体激元激发所引发的陡峭相位变化。显然,正负群延迟可通过狄拉克半金属的费米能和弛豫时间进行主动调控。我们认为,这种增强且可调的延迟方案在中红外波段的光学延迟器件制备及其他应用中颇具前景。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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