Figure | Working principle of the subarray programmable terahertz metasurface. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure | Working principle of the subarray programmable terahertz metasurface.

Caption

Figure | Working principle of the subarray programmable terahertz metasurface. The device consists of four independently gated AlGaN/GaN HEMT subarrays. Each subarray can be electrically controlled through the gate voltage, which changes the two-dimensional electron gas and tunes the terahertz transmission. Through subarray coding, the same metasurface can perform optical Boolean logic and PAM-4 amplitude modulation.

Credit

Lan Wang et al.

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