Abstract
A tunable terahertz (THz) chain-link metamaterial (CLM) is presented, which is composed of a tailored Au layer fabricated on Si substrate. CLM exhibits bidirectional polarization-dependent characteristic by applying a direct-current (dc) bias voltage on device. This CLM device can be heated up the surrounding temperature to tune the corresponding resonance. The tuning range is 0.027 THz from 0.318 THz to 0.291 THz on the bias of 0.60 V to 1.32 V. By reconfiguring the gap between CLM, there are single-resonance with red-shift at TE mode, and multi-resonance with blue-shift and red-shift at TM mode, respectively. These characterizations of CLM are polarization-dependence and bidirectional tunability. These results show the electromagnetic responses of proposed CLM device is suitable for the uses for resonator, filter, switch, and sensor in the THz frequency range.
Highlights
Terahertz (THz) wave is the transition spectrum from microwave to infrared (IR) wavelength which occupies the spectrum in the frequency range of 0.1 THz to 10 THz
We propose an active tuning mechanism to manipulate THz wave by using electrostatic force to perform the reconfigurable metamaterials based on micro-electro-mechanical system (MEMS) technology, which has been widely used in the realization of movable nanostructures and microstructures, providing an ideal platform for the direct reconstruction of metamaterials
Such electromagnetic response of Fano-resonance is artificially created by the induced anisotropic near-field coupling
Summary
Terahertz (THz) wave is the transition spectrum from microwave to infrared (IR) wavelength which occupies the spectrum in the frequency range of 0.1 THz to 10 THz. To improve the flexibility of THz metamaterial, there are a lot of literatures reported the tuning mechanisms by using semiconductors[14,15], phase transition materials[16,17], and superconducting materials[18,19], stimulated by thermal[20,21,22,23], optical[24,25], electrical[26], and magnetic[27] input signals These active tuning approaches have been great interest and significance for scientists in real-world applications[20,28,29,30,31]. It can be observed in the resonance tuning by varying environmental temperature of CLM, which creates the possibility to be used in high-efficiency environmental sensor application This design of MEMS-based CLM opens an avenue to the active tunability of THz waves manipulations with great bidirectional tunability and good polarization-dependence. It can be potentially used in real-world applications such as active sensors, biomedical imaging, flexible electronics, modulators and so on
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