Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 29: Photonik 2
Q 29.2: Vortrag
Dienstag, 13. März 2012, 14:15–14:30, V38.01
Fine structure of reflection — •Jörg Götte1 and Mark Dennis2 — 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden — 2School of Physics, University of Bristol, HH Wills Physics Lab, Tyndall Avenue, Bristol BS8 1TL, UK
The reflection of a light beam from a planar interface is a everyday familiar phenomenon - as long as we do not look too closely. Looking at a length scale comparable to the wavelength of the light reveals that confined beams of light may appear shifted upon reflection, both within the plane of incidence (Goos-Hänchen shift) and orthogonal to it (Imbert-Fedorov shift). These lateral and transverse spatial shifts find their analogues in the angular domain and light beams may also experience a small deflection upon reflection.
The nature of these shifts depends on Fresnel coefficients and hence on the material parameters, as well as the polarization and the spatial structure of the incident light beam. Upon reflection from an interface the homogeneity of the incident polarization is generally destroyed, which is why it is possible to observe different shifts through different settings of a polarization analyser.
An intriguing method to explore this family of shift effects is the use of optical vortices as positional markers. Upon reflection a higher order vortex splits up into a `constellation' of simple vortices which is characteristic for the nature of reflection. We show how the constellation of vortices offers a closer look at the effects of reflection at the centre of the beam and how this is directly connected to shifts of the overall beam intensity.