Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 25: Plasmonics and nanooptics: Light-matter interaction, spectroscopy II
O 25.8: Talk
Tuesday, March 13, 2018, 12:15–12:30, MA 041
Tunability of ferroelectric superlenses in the mid-infrared regime — •Lukas Wehmeier1, Jonathan Döring1, Stephan Winnerl2, Susanne C. Kehr1, and Lukas M. Eng1 — 1Technische Universität Dresden, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, Germany
A superlens utilizes negative permittivity materials to create optical near-field images beyond the diffraction limit [1]. Ferroelectric perovskites are preferential candidates for designing superlenses at infrared (IR) wavelengths [2,3,4] since they intrinsically possess a negative permittivity close to a sample phonon resonance [5]. Nevertheless, superlensing is usually restricted to a narrow spectral range, only. This inherently screams for superlenses with optical tunability.
In this presentation, the evanescent image formed by bulk ferroelectrics and ferroelectric superlenses is inspected by applying scattering scanning near-field optical microscopy and spectroscopy. Particularly, we focus on the impact of the ferroelectric polarization; we will show, that polarization control via applying external electric fields provides a great potential for superlens tuning via local-scale optical anisotropies.
[1] J. B. Pendry, Phys. Rev. Lett. 85, 3966 (2000).
[2] T. Taubner et al., Science 313, 595 (2006).
[3] S. C. Kehr et al., Nat. Commun. 2, 249 (2011).
[4] S. C. Kehr et al., ACS Photonics 3, 20 (2016).
[5] S. C. Kehr et al., Phys. Rev. Lett. 100, 256403 (2008).