Frequency Division Multiplexing of Terahertz Waves Realized by Diffractive Optical Elements

Recently, one of the most commonly discussed applications terahertz radiation is wireless telecommunication. It believed that future 6G systems will utilize this frequency range. Although exact technology telecommunication not yet known, it certain methods for increasing their bandwidth should be investigated in advance. In paper, we present diffractive optical elements division multiplexing waves. The structures have been designed as a combination binary phase grating and converging lens. allows differentiating frequencies, while lens assures separation focusing at finite distance. Designed manufactured from polyamide PA12 using SLS 3D printer verified experimentally. Simulations experimental results are shown different focal lengths. Moreover, parallel data transmission two channels carrier frequencies propagating same path. structure allowed detecting both signals independently without observable crosstalk. proposed can work wide range sub-terahertz depending on design assumptions. Therefore, they considered an appealing solution, regardless band finally used by systems.