Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 43: Optische Messtechnik

Q 43.6: Vortrag

Mittwoch, 21. März 2007, 15:15–15:30, 5E

Polarization effect in the transmission through a single nanoscopic aperture — •Jochen Müller, Peter Banzer, Susanne Quabis, and Gerd Leuchs — Max Planck Research Group, Institute of Optics, Information and Photonics, University Erlangen-Nuremberg, Guenther-Scharowsky-Str. 1 / Bau 24, 91058 Erlangen

In the recent years the investigation of transmission through sub wavelength holes in thin metal films has intensified in order to gain a better understanding at a fundamental level. Much work has been published studying arrays of holes. In contrast, we experimentally study the transmission of a single aperture and compare our results to rigorous numerical calculation based on FDTD algorithm.

We concentrate on investigating the influence of polarization distributions which are non-homogeneous on a scale of less than one wavelength. For this purpose we generate radially and azimuthally polarized beams at wavelengths of 775 nm and 532 nm which are focussed by a high numerical aperture microscope objective onto each aperture. As a sample we use a silver covered glass substrate which is structured with apertures of different types and sizes.

For holes as well as for annular rings with diameters smaller than the wavelength we find a strong polarization effect on the transmitted power. In this talk, we will apply the concept of cylindrically symmetric waveguide Eigenmodes to our results. Furthermore, the FDTD model calculation reveals the excitation of surface plasmons to play an important role.