Fig. 5: Far-infrared transparent conductive properties and electromagnetic shielding efficiency of high-ε_opt materials.

a Far-infrared transmission spectra, b conductivity, average transmittance, and c FOM for r-Bi₂Se_2.4, r-Bi₂Te_2.4, r-Bi₂Se_1.8Te_0.7, r-PbSe_1.6. We have removed the 2.5–3 μm data due to the presence of instrument-generated miscellaneous peaks and connected the data with dashed lines for aesthetic reasons. d Diagram of electromagnetic shielding principle (left) and self-built electromagnetic shielding efficiency test system (right). e Far-infrared transmittance and electromagnetic shielding efficiency for Bi₂Se_2.4 film and Au mesh