title: Terahertz Brewster lenses.
abstract: Typical lenses suffer from Fresnel reflections at their surfaces, reducing the transmitted power and leading to interference phenomena. While antireflection coatings can efficiently suppress these reflections for a small frequency window, broadband antireflection coatings remain challenging. In this paper, we report on the simulation and experimental investigation of Brewster lenses in the THz-range. These lenses can be operated under the Brewster angle, ensuring reflection-free transmission of p-polarized light in an extremely broad spectral range. Experimental proof of the excellent focusing capabilities of the Brewster lenses is given by frequency and spatially resolved focus plane measurements using a fiber-coupled THz-TDS system.
authors.affiliation: Fachbereich Physik, Philipps-Universität Marburg, Marburg, Germany. matthias.wichmann@physik.uni-marburg.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Wichmann
authors.forename: Benedikt
authors.initials: B
authors.lastname: Scherger
authors.forename: Steffen
authors.initials: S
authors.lastname: Schumann
authors.forename: Sina
authors.initials: S
authors.lastname: Lippert
authors.forename: Maik
authors.initials: M
authors.lastname: Scheller
authors.forename: Stefan F
authors.initials: SF
authors.lastname: Busch
authors.forename: Christian
authors.initials: C
authors.lastname: Jansen
authors.forename: Martin
authors.initials: M
authors.lastname: Koch
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D008962:Models, Theoretical; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D055053:Terahertz Radiation