We demonstrate that a single-layer coating on a doped GaAs or Si substrate enables broadband antireflection and. hence. broadband perfect absorption in the terahertz frequency range. This broadband behavior can be generally expected when the substrate material has a Drude-type dispersion. https://www.ealisboa.com/great-deal-Pentair-Union-Collar-2-U11-200PS-super-offer/