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HL: Fachverband Halbleiterphysik

HL 60: Poster II: Optical Properties, incl. Photonic Crystals and Ultrafast Phenomena

HL 60.20: Poster

Donnerstag, 25. März 2010, 18:00–20:00, Poster D1

Optical spectroscopy on rolled-up metal semiconductor microtubes in the visible and infrared regime — •Jochen Kerbst, Stephan Schwaiger, Markus Broell, Ricardo Costa, Jens Ehlermann, Andrea Stemmann, Yuliya Stark, Detlef Heitmann, and Stefan Mendach — Institut für Angewandte Physik, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg

Strained planar metal and semiconductor films are rolled up with multiple rotations to create three-dimensional metamaterials which show the extraordinary optical behavior of a hyperlens [1]. In order to investigate the optical properties of the microtube walls we perform reflection and transmission measurements, respectively, at or through the walls of the microtube. The transmission measurements are realized by manipulating a tapered optical single mode fiber into the tube. At the untapered end the fiber is connected to a supercontinuum white light source with broadband output from 500nm to 2400nm. Holes prepared in the metallized fiber tip emit light which transmits through the walls of the microtube and is collected with a 50x near-infrared-corrected microscope objective and detected with an InGaAs photodiode. By comparing the experimental results with calculations using the transfer matrix method we obtain the effective permittivity of the microtube walls. We find that their plasma frequency is in the visible regime. We gratefully acknowledge support by the SFB 508 and the DFG through GrK 1286.

[1] S. Schwaiger et al., Physical Review Letters 102, 163903 (2009)