Two-Bit Terahertz Encoder Realized by Graphene-Based Metamaterials

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.

Inverse engineering of electromagnetically induced transparency in terahertz metamaterial via deep learning

“…Recently, some novel techniques have been applied to terahertz (THz) research areas, such as THz dynamic devices with graphene [1] and a THz spoof surface plasmon polariton coupler with coherent quantum control [2,3]. THz electromagnetically induced transparency (EIT) metamaterial has been well developed and attracts considerable attention.…”

Engineering Metamaterials: Present and Future

“…The studied sensor is characterized by relatively high sensitivity and good linearity and can be used for the biomass estimation inside microfluidic bioreactors. Two-bit terahertz encoder realized by graphene-based metamaterials is proposed and studied in Reference [15]. The encoder involves graphene-based metamaterials, in which the graphene structures are controlled by electric voltage applied to external electrodes.…”

Field enhancement effect in graphene-based terahertz nano metasurfaces

“…Researchers have designed a large number of functional devices in terahertz band, such as superstructure lens [3], sensor [4], modulator [5] , encoder [6] and so on. Some researchers have focused on field-enhanced terahertz devices.…”