Analog of electromagnetically induced transparency in metasurfaces composed of identical dielectric disks
Analog of electromagnetically induced transparency in metasurfaces composed of identical dielectric disks
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DOI：
10.1063/5.0036500
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发表时间：
2021-02
影响因子：
3.2
通讯作者：
S. Jamilan;G. Semouchkin;E. Semouchkina
中科院分区：
文献类型：
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作者：
S. Jamilan;G. Semouchkin;E. Semouchkina
在由简单圆柱形状的相同介质谐振器组成的亚表面(MSS)中，揭示了一种类似于电磁诱导透明的现象。在光学和微波频率下的数值实验中检测到了它，并在微波范围内得到了实际实验的证实。观察到的现象的主要特点是它出现在MS元件的电偶极共振(EDR)频率上，而不是希望全反射入射波而不是透射波。通过研究MSS中的电场分布，可以探测到由入射波定义的背景辐射和介质粒子中的共振场振荡产生的辐射之间的相互作用所引起的几个Fano共振。发现了π弧度共振振荡相位的变化特征，控制了参与波过程之间从相长干涉到相消干涉的转变。相消干涉的开始以信号相位光谱中π弧度的急剧跳跃为标志。分析表明，在沿电场方向排列的谐振器之间的缝隙中观察到的Fano共振处的零信号可以作为实现MSS透明所需条件的指标。这些条件包括消除背景辐射的存在，从而消除侵入波与MSS之间的相互作用。
An analog of electromagnetically induced transparency was revealed in metasurfaces (MSs), composed from identical dielectric resonators of simple cylindrical shapes. It was detected in numerical experiments at optical and microwave frequencies and confirmed by real experiments in the microwave range. The main specific of the observed phenomenon was its appearance at frequencies of electric dipolar resonances (EDRs) in MS elements, when total reflection of incident waves instead of transmission was expected. Investigations of electric field distributions in MSs allowed for detecting several Fano resonances caused by interaction between background radiation defined by incident waves, and radiation produced by oscillations of resonance fields in dielectric particles. The characteristics for EDR changes in phases of resonance oscillations by π radians were found controlling the transitions from constructive to destructive interference between participating wave processes. The onset of destructive interference was marked by sharp jumps by π radians in the spectra of signal phases. Performed analysis revealed that zero signals at Fano resonances, observed in the gaps between resonators, arranged along the electric field direction, could serve as indicators of realizing the conditions necessary for the transparency of MSs. These conditions included the elimination of the presence of background radiation and thus of interaction between trespassing waves and MSs.