Negative group delay through subwavelength hole arrays
Negative group delay through subwavelength hole arrays
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通过亚波长孔阵列的负群延迟
DOI：
10.1103/physrevb.84.075151
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发表时间：
2011
影响因子：
3.7
通讯作者：
V. Lomakin
中科院分区：
文献类型：
--
作者：
M. Navarro‐Cía;M. Beruete;F. Falcone;M. Sorolla;V. Lomakin
结果表明，通过周期光栅的共振和瑞利-伍德反常，可以获得负群延迟的超光速传输。理论，数值和实验结果给出（亚）毫米波场通过一个阵列的亚波长孔和介电板之间的夹层传输。其物理基础是共振异常和瑞利-伍德异常的耦合。共振异常的出现是由于周期性阵列诱导的入射场耦合到介质板TM或TE导模，而瑞利-伍德异常与传播和倏逝衍射级之间的功率重新分配有关。得出的结论适用于一般的周期性光栅工作在制度的耦合共振和瑞利-伍德异常。© 2011美国物理学会。
It is demonstrated that superluminal transmission with a negative group delay can be obtained through a periodic grating supporting resonant and Rayleigh-Wood anomalies. Theoretical, numerical, and experimental results are given for (sub)millimeter wave fields transmitted through an array of subwavelength holes and sandwiched between dielectric slabs. The underlying physics is the coupling of resonant anomalies and Rayleigh-Wood anomalies. The resonant anomalies appear due to the periodic array-induced coupling of the incident field to the dielectric slab TM or TE guided modes while the Rayleigh-Wood anomalies are related to the redistribution of power between propagating and evanescent diffraction orders. The conclusions reached apply to general periodic gratings operating in the regime of coupled resonant and Rayleigh-Wood anomalies. © 2011 American Physical Society.