Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 49: Optical Properties

HL 49.5: Vortrag

Donnerstag, 25. März 2010, 10:30–10:45, H14

Transmission and Reflection Measurements on Rolled-up Microtubes — •Stephan Schwaiger, Markus Bröll, Jochen Kerbst, Jens Ehlermann, Ricardo Costa, Andreas Rottler, Andrea Stemmann, Yuliya Stark, Detlef Heitmann, and Stefan Mendach — Institut für Angewandte Physik, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg

Strained metal-semiconductor nano layers can be rolled-up into microtubes with a rolled-up carped like shape [1]. The walls of these microtubes represent effective media with anisotropic permittivity. Finite difference time domain simulations show that the microtubes can be used for imaging below the diffraction limit. To characterize the imaging behaviour of the microtubes we performed transmission and reflection measurements. The transmission through the walls of the tubes can be measured by placing a tapered optical single mode fiber inside the microtube. Holes which are prepared into the tip of the fiber by means of focused ion beams act as light emitters illuminating the microtube from the inside. Subsequently the transmitted light is detected by an optical microscope. Comparison of the measurements with calculations using the transfer matrix method show that the walls of the tubes can be described with an effective plasma frequency which can be tuned within the visible and near infrared regime by changing the metal and semiconductor layer thickness ratio [2]. We gratefully acknowledge support by the DFG through GrK 1286 and SFB 508.

[1] V. Ya. Prinz et al., Physica E 6, 828 (2000)

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