Electrically Controllable Molecularization of Terahertz Meta‐Atoms |
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| Authors: | Hyunseung Jung Jaemok Koo Eunah Heo Boeun Cho Chihun In Wonwoo Lee Hyunwoo Jo Jeong Ho Cho Hyunyong Choi Moon Sung Kang Hojin Lee |
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| Affiliation: | 1. School of Electronic Engineering, Soongsil University, Seoul, South Korea;2. Department of Chemical Engineering, Soongsil University, Seoul, South Korea;3. School of Electrical and Electronic Engineering, Yonsei University, Seoul, South Korea;4. Department of Information Communication, Materials, and Chemistry Convergence Technology, Soongsil University, Seoul, South Korea;5. School of Chemical Engineering, SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, South Korea |
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| Abstract: | Active control of metamaterial properties is critical for advanced terahertz (THz) applications. However, the tunability of THz properties, such as the resonance frequency and phase of the wave, remains challenging. Here, a new device design is provided for extensively tuning the resonance properties of THz metamaterials. Unlike previous approaches, the design is intended to control the electrical interconnections between the metallic unit structures of metamaterials. This strategy is referred to as the molecularization of the meta‐atoms and is accomplished by placing graphene bridges between the metallic unit structures whose conductivity is modulated by an electrolyte gating. Because of the scalable nature of the molecularization, the resonance frequency of the terahertz metamaterials can be tuned as a function of the number of meta‐atoms constituting a unit metamolecule. At the same time, the voltage‐controlled molecularization allows delicate control over the phase shift of the transmitted THz, without changing the high transmission of the materials significantly. |
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| Keywords: | graphene ion gels metamaterials molecularization terahertz |
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