Hwang J S, Kim Y J, Yoo Y J, Kim K W, Rhee J Y, Chen L Y, Li S R, Guo X W, Lee Y P
Opt Express. 2018 Nov 26;26(24):31607-31616. doi: 10.1364/OE.26.031607.
We investigated the electromagnetically induced transparency (EIT)-like effects in planar metamaterials (MMs) at microwave (GHz) frequencies. The specific MMs that were used in this study consist of cut-wire resonator/ring resonator, which achieved the dual EIT-like effects in a single-layer through the bright- and quasi-dark-mode coupling and the lattice mode coupling. In addition, by varying the distance between the two resonators, the quad-band EIT spectral response in the microwave region was obtained, and the group refractive index at the EIT-like resonance of proposed design reached up to 4,000. This study provides the design approach to the multispectral EIT-like effects and might suggest potential applications in a variety of fields, for example, low-loss slow-light device, multiple switching sensor, and other sensing devices.
我们研究了平面超材料（MMs）在微波（GHz）频率下类似电磁诱导透明（EIT）的效应。本研究中使用的特定超材料由切割线谐振器/环形谐振器组成，通过亮模和准暗模耦合以及晶格模式耦合在单层中实现了类似双EIT的效应。此外，通过改变两个谐振器之间的距离，获得了微波区域的四波段EIT光谱响应，所提出设计的类似EIT共振处的群折射率高达4000。这项研究提供了实现多光谱类似EIT效应的设计方法，并可能暗示在各种领域的潜在应用，例如低损耗慢光器件、多重开关传感器和其他传感设备。
