Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 17: Plasmonic Systems

HL 17.7: Vortrag

Montag, 26. März 2012, 16:30–16:45, EW 203

Functionality and Dielectric Function Retrieval of a Rolled-Up Hyperlens — •Andreas Rottler, Stephan Schwaiger, Markus Bröll, Detlef Heitmann, and Stefan Mendach — Institute of Applied Physics, University of Hamburg, Germany

Three-dimensional metamaterials made of rolled-up metal/semiconductor microtubes have recently gained much attention due to their ability to work as hyperlenses in the visible regime [1]. In this talk we present finite-difference time-domain (FDTD) simulations to analyze the functionality of such hyperlens systems together with a dielectric function retrieval. The real and imaginary part of the dielectric function of a rolled-up metal/semiconductor hyperlens is retrieved from experimental reflection and transmission data and from data calculated by the transfer matrix formalism. The retrieved dielectric function is compared to a well-known effective medium model for metal/semiconductor superlattices [2]. It turned out that for the fabricated samples there is some agreement with the effective medium model for frequencies below the plasma frequency. However, for higher frequencies, the retrieved permittivity strongly deviates. In additional FDTD simulations we show that, interestingly, the hyperlens functionality of our realized structures is preserved, even far beyond the effective plasma frequency.

We gratefully acknowledge support by the DFG via the Graduiertenkolleg 1286.

[1] S. Schwaiger et al., Phys. Rev. Lett. 102, 163903 (2009).

[2] B. Wood et al., Phys. Rev. B 74, 115116 (2006).