High-transmission and large group delay terahertz triple-band electromagnetically induced transparency in a metal-perovskite hybrid metasurface

Abstract

A high-transmission and large group delay terahertz triple-band electromagnetically induced transparency (EIT) effect is obtained in a metal-perovskite hybrid metasurface, which consists of a cross metal (CM), a pair of...

Design and experimental realization of triple-band electromagnetically induced transparency terahertz metamaterials employing two big-bright modes for sensing applications

“…The surface patterned aluminum array of the triple-band transparency effect is merely formed by two sub-resonators, namely a fork-shaped resonator (FSR) and a U-shaped split-ring resonator (USRR), which correspond to two different “big-bright” resonance modes. Unlike the traditional bright mode in the EIT effects, 24–44 the “big-bright” resonance mode obtained here possesses two independent resonance dips having different frequencies, and the combination (or coupling) of these two sets of “big-bright” modes gives rise to a triple-band transparency response, resulting in three transparent windows at frequencies of 0.56 THz, 1.10 THz, and 1.33 THz. This of course also reduces the complexity of designing metamaterial basic cells and introduces different physical mechanisms to achieve a triple-band EIT response.…”

“…40 In addition to the widely reported dual-band transparency effect, the development of triple-band EIT resonance devices is also in full swing. [41][42][43][44] For instance, multiple patterned graphene sub-resonators distributed in four alternating stacked layers were theoretically reported. 41 A coplanar structure formed by five different-sized metallic elements, including a cross, a pair of square frames, and a pair of square SRRs, was theoretically proposed to obtain a triple-band EIT response.…”

“…41 A coplanar structure formed by five different-sized metallic elements, including a cross, a pair of square frames, and a pair of square SRRs, was theoretically proposed to obtain a triple-band EIT response. 42 Two sets of arc-ring-type resonators having six different subresonators were theoretically presented to realize the tripleband EIT functional device by our group. 44 Although there have been some meaningful advances in the research of dual-band and triple-band EIT effects, they have the following shortcomings or aspects that need improvement.…”

“…The triple-band EIT functional devices typically require more sub-resonators in their basic cells. [41][42][43][44] This seems to have entered a strange cycle: the more the transparent peaks are, the more complex the basic cell designs are, and the more the sub-resonators are. [38][39][40][41][42][43][44] The fundamental reason for this phenomenon is that these papers use brightbright coupling, where each sub-resonator corresponds to a single resonance mode, and the result is that only the presence of a large number of sub-resonators in their basic cells, usually exceeding the number of transparent peaks, could achieve multi-band transparency effects.…”

“…[41][42][43][44] This seems to have entered a strange cycle: the more the transparent peaks are, the more complex the basic cell designs are, and the more the sub-resonators are. [38][39][40][41][42][43][44] The fundamental reason for this phenomenon is that these papers use brightbright coupling, where each sub-resonator corresponds to a single resonance mode, and the result is that only the presence of a large number of sub-resonators in their basic cells, usually exceeding the number of transparent peaks, could achieve multi-band transparency effects. 14,[38][39][40][41][42][43][44] This kind of design is unfavorable for the compact structural dimension and could bring certain difficulties to device preparation, resulting in one of the current situations being that there are few experimental reports on the triple-band EIT effect, and most of them are presented through theoretical simulation and theoretical code results.…”