Journal
ACS PHOTONICS
Volume 9, Issue 5, Pages 1814-1820Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.2c00397
Keywords
molecularization; metamaterial; terahertz; ion-gel; graphene
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Funding
- National Research Foundation of Korea (NRF) through the government of Korea [2020R1A2C1012710, 2021R1A2C2008332]
- National Research Foundation of Korea [2020R1A2C1012710, 2021R1A2C2008332] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This paper proposes a reconfigurable terahertz metamaterial device that allows for controllable resonance properties through selective control of electrical connections between meta-atoms. This device can serve as a multistate, transmissive terahertz filter and be used for terahertz dichromatic vision.
Active terahertz metamaterial devices with controllable resonance proper-ties have been commonly investigated. However, owing to the limited tunability of theirfrequencies and low-quality factor resonances, these devices are difficult to adopt as single-devicefilters that can actively adjust diverse spectral information. Moreover, they typicallyrequire complex instrumentation for regulating terahertz waves. In this paper, we proposereconfigurable molecularization of terahertz meta-atoms allowing on-demand realization ofresonance characteristics in a single active terahertz metasurface. This is achieved byselectively controlling the electrical connections between the meta-atoms usingmicropatterned ion-gel gating structures. Based on this operation scheme, the resonancecharacteristics of the terahertz metamaterial can be controlled electrically, and it can serveas a multistate, transmissive metamaterialfilter with resonance frequencies tunable from 0.5to 1.3 THz. In addition, the reconfigurable molecularization of terahertz meta-atoms allowsproducing a transmissive metamaterial showing controllable transmission resonance toterahertz waves. Exploiting the versatility of an active metasurface, we demonstrateterahertz dichromatic vision distinguishing different saccharides without using spectroscopy systems
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