Second Vienna Symposium on the Foundations of Modern Physics in Honour of Daniel Greenberger and Helmut Rauch Mitschnitt einer gemeinsamen Veranstaltung des Instituts für Quantenoptik und Quanteninformation der ÖAW (IQOQI) und der Fakultät für Physik der Universität Wien am Donnerstag, dem 11. Juni 2009 im Lise Meitner-Hörsaal der Fakultät für Physik Teil 17b: - Han Woerdman: Observing Nonspecular Reflection of a Light Beam Moderation: Dmitry Budker Abstract: The Law of Reflection of a light ray incident upon a planar mirror was first formulated by Euclid around 300 BC in his book Catoptrics; it has been a tenet of geometrical optics ever since. However, more recently a small angular deviation of the Law of Reflection has been predicted for a physical light beam, when this is regarded as the implementation of a ray. The deviation is a diffractive consequence of the angular dependence of the reflectivity; it should occur for any mirror with <100% reflectivity. We report here experimental proof of this angular deviation, by determining the direction of an optical beam after reflection from an air-glass interface, using an optical position detector with nanometer resolution. The angular deviation displays a dispersive Lorentzian resonance near the Brewster angle. Our results are relevant for angular metrology in general and cantilever-based surface microscopies in particular. Analogous angular deviations are expected for reflection of acoustic waves and quantum matter waves. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Basics of reflection 00:00:24 3. Theory of Goos-Hänchen shift 00:07:17 4. Polarization of the reflected beam 00:15:29 5. Technical setup 00:22:21 6. Experimental results 00:27:20 7. Questions from the audience 00:32:57

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