Enhanced Transmission of Thz Radiation Through Fe2+: ZnSe Crystals

By doping ZnSe crystals with Fe
²
+ ions at a level of 0.23 wt. %, the transmission of broadband terahertz (THz) radiation from 0.4 to 0.5 THz range have been enhanced for up to 20%. The sample transmission was carried out using a terahertz time-domain spectroscopy setup. To explain the arising effect and changes in band structure, non-linear absorption of undoped and Fe-doped ZnSe samples were studying using femtosecond pump - supercontinuum probe spectroscopy in visible and NIR spectral ranges. Such enhanced transmission of Fe
²
+: ZnSe can be applied for creating terahertz radiation control devices.