Dresden 2014 – wissenschaftliches Programm
O 71.8: Vortrag
Donnerstag, 3. April 2014, 12:15–12:30, GER 38
Topological optical-phase transitions in superlensing imaging — •Peining Li1, Thomas Taubner1, Jon Schuller2, Mark Brongersma2, Chris Fietz3, Yaroslav Urzhumov3, Dmitriy Korobkin3, Gennady Shvets3, and Rainer Hillenbrand4 — 1I. Institute of Physics (IA), RWTH Aachen University, Aachen 52056, Germany — 2Geballe Lab for Advanced Materials, Stanford University, Stanford, California 94306, USA — 3Department of Physics and Center for Nano and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712, USA — 4CIC nanoGUNE Consolider, 20018 Donostia-San Sebastián, Spain
Metamaterials show great capabilities to artificially engineer the light-matter interactions. It has been recently shown that tuning the optical dispersion of metamaterials from ellipsoidal dispersion to hyperbolic dispersion enables a substantial intensity-enhancement of high-spatial-frequency (or high-k) optical fields. In this work, we focus on the phase behavior of high-k fields within the dispersion transition of metamaterials. By using interferometric scanning near-field optical microscopy, we are able to record phase information of the superlens, which is usually lost in the intensity-recording measurements. We experimentally reveal a phase transition of optical near fields in an infrared metamaterial superlens when its dispersion altering between two different kinds of hyperbolic dispersions. Our results illuminate the important role of phase imaging in superlensing, which are also useful for understanding phase behaviors in other metamaterial-based imaging devices such as perfect-lens, hyperlens and meta-lens.