Abstract
Terahertz radiation from 100 to 400 cm−1 of FeCrAl alloy wires has been studied by Fourier Transform Spectrometer. The different surfaces of the alloy wires prepared by physical cleaning method (polished by sandpapers) and chemical corrosion method (corroded in HCl and HAc solution), induced different terahertz radiation. Energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS) analysis confirmed that the surface oxide included α-Fe2O3, FeO, Fe3O4, Cr2O3 and Al2O3 with the thickness of 5 μm. Terahertz spectra showed that with the increase of the oxide content, the intensity of the terahertz radiation obviously decreased in the range of 50–500 cm−1. Attributing to the existence of oxide with the magnetic energy changed in the demagnetization process, a red shift of the terahertz spectra was found. Surface roughness and carbide content weakly affected the terahertz radiation intensity. Finally, the terahertz radiation mechanism derived from the different surface states has been discussed. These results are expected to provide new perspectives for the application of broadband terahertz sources.
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