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Course: Thin Films

Department/Abbreviation: SLO/TVY

Year: 2021

Guarantee: 'Ing. Jaromír Křepelka, CSc.'

Annotation: The aim is to familiarize students with the basic optical characteristics of systems composed from thin isotropic, homogeneous (and inhomogeneos) layers designed from dielectric and also metal materials including their applications. The attention is also paid to the propertiesof ideal thick layers and their combinations with thin film systems, and anisotropic layers too. The theory is based on the solution of Maxwell equations for plane waves, from which the formulae for transformation of tangential components of electric and magnetic field are derived and measurable macroscopic parameters (reflectivity, transparency, absorbtion) are defined. There are discussed theoretically interesting problems, for instance the reversibility principle, principle of equivalence for symetrical system of layers, the thin film behaviour in partly coherent light field, colour effects within thin films, the relation of thin films to the wave guided structures and the relation of periodical structures to photonic crystals. The examples of practical design problems are solved especially using anisotropic structures, highly reflecting systems, narrow band filters and polarising beam splitters.

Course review:
Properties of thin layers, methods of production of thin layers and their inspections. Propagation of electromagnetic field in isotropic non-homogeneous medium, solution of wave equation in homogeneous isotropic medium, matrix description of systems of thin layers, transformation of the field and transfer of energy in systems of thin layers, principle of reversibility. Examples: interface of two media, one thin layer, one thick layer, systems of thin and thick layers, layer in partially coherent light, field inside the system of thin layers, symmetrical systems, periodic structures, antireflective structures, MacNeill polarizer, Fabry-Perot filter. Basics of evaluation of ellipsometric measurement. Anisotropic layered media.