Terahertz tuning devices based on a wedge-shaped defect of aluminum plates

Abstract

Although terahertz (THz) spectrum has been opened for the next generation (6 G) communication to meet the currently explosive growth of communication bandwidth, efficiently manipulating THz radiation to fulfil the conceptual network communication technology is still difficult due to the lack of functional devices. As a kind of communication technology, frequency division multiplexing and tuning are essential in the THz frequency range. We adopt laser ablation method to fabricate a kind of parallel aluminum plate waveguides with wedge-shaped defects and realize narrow band frequency selecting and tuning to mimic a traditional radio. When we turn the knob, the working frequency of the waveguide device shifts accordingly, whose mechanism is attributed to the local resonances at defects. The proposed simple fabrication method paves the way for creating various THz functional devices.