A High-order THz Amplitude Modulator Based on Subarray Coding Metamaterial

In this paper, a high-order THz amplitude modulator based on subarray coding strategy is proposed. The HEMT is integrated into the metal microstructure, and the modulation state can be changed by adjusting the voltage to form a 1-bit amplitude modulation unit. Furthermore, we divide and encode the artificial microstructure array to enable joint modulation between subarrays and realize multi-bit high-order amplitude modulation of THz wave through different subarray coding sequences. This work may promote the development of THz quasi-optical modulators, especially high-order amplitude modulation.