Tailoring the slow light behavior in terahertz metasurfaces
Tailoring the slow light behavior in terahertz metasurfaces
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DOI：
10.1063/1.4919531
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发表时间：
2015-05-04
影响因子：
4
通讯作者：
Singh, Ranjan
中科院分区：
文献类型：
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作者：
Manjappa, Manukumara;Chiam, Sher-Yi;Singh, Ranjan
实验研究了近场耦合对光在太赫兹超表面传输的影响。我们的研究结果表明，调整谐振器之间的耦合可以调制在耦合系统中不同类型不对称下产生的电磁感应传输的幅度。观察到的透射幅值的变化归因于强近场耦合附近谐振腔之间的破坏性干涉量的变化。我们采用双粒子模型从理论上研究了亮模和准暗模之间的耦合对系统传输特性的影响，结果与我们的观测结果非常吻合。除了增强的传输特性外，我们的研究结果还对原子电磁感应透明的超材料类似物提供了更深入的了解，并为设计慢光器件、宽带滤波器和太赫兹频率的衰减器提供了一种方法。(C) 2015 AIP出版有限责任公司
We experimentally study the effect of near field coupling on the transmission of light in terahertz metasurfaces. Our results show that tailoring the coupling between the resonators modulates the amplitude of resulting electromagnetically induced transmission, probed under different types of asymmetries in the coupled system. Observed change in the transmission amplitude is attributed to the change in the amount of destructive interference between the resonators in the vicinity of strong near field coupling. We employ a two-particle model to theoretically study the influence of the coupling between bright and quasi-dark modes on the transmission properties of the system and we find an excellent agreement with our observed results. Adding to the enhanced transmission characteristics, our results provide a deeper insight into the metamaterial analogues of atomic electromagnetically induced transparency and offer an approach to engineer slow light devices, broad-band filters, and attenuators at terahertz frequencies. (C) 2015 AIP Publishing LLC.