Abstract
Terahertz (THz) technologies have achieved great progress in the past few decades. Developing active devices to control the THz waves is the frontier of THz applications. In this paper, a new scheme of two-bit THz encoder is proposed. Different from the present THz modulators whose spectra at different bands are varied simultaneously, our encoder can realize the individually efficient modulation of every channel. The encoder comprises the double-sided graphene-based metamaterials, in which the graphene structures on each side are connected to the external electrodes individually. The well-designed metamaterials on the front and back sides determine the resonances at two different bands (0.20 THz and 0.33 THz) separately. Through simulating the performance of this device by changing the conductivities of the graphene on each side independently, we demonstrate two-bit encoding realized by the dual-band modulation of transmission amplitude with electronic control, and the modulation depth can reach as high as 79.6%. Our encoder can promote the development of multifunctional and integrated devices, such as frequency division multiplexers and logical circuitry, which will contribute to THz communications.
Highlights
Terahertz (THz) radiation is generally referred to the frequency range of 0.1 to 10 THz, which is located between infrared and microwave bands in the electromagnetic spectrum
We propose a two-bit THz encoder based on hybrid metamaterials, which can independently modulate two different bands with high efficiency
(Computer Simulation Technology) microwave studio, we simulate the transmission spectra of the device, and we demonstrate two-bit encoding based on the dual-band independent switches by tuning the Fermi level of the graphene with voltage control
Summary
Terahertz (THz) radiation is generally referred to the frequency range of 0.1 to 10 THz, which is located between infrared and microwave bands in the electromagnetic spectrum. Developing an encoder is not a simple superposition of different modulators in one device To solve those problems, we design the THz encoder by applying dual-sided hybrid metamaterials, which can separately control the voltages (front and back sides of our device) to achieve different coding function. We propose a two-bit THz encoder based on hybrid metamaterials, which can independently modulate two different bands with high efficiency. Utilizing CST (Computer Simulation Technology) microwave studio, we simulate the transmission spectra of the device, and we demonstrate two-bit encoding based on the dual-band independent switches by tuning the Fermi level of the graphene with voltage control. With simple structure and easy operation, may contribute to the promotion of multifunctional and integrated devices, such as frequency division multiplexers and logical circuitry
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