TY - JOUR
KW - Electricity
KW - Methodology
KW - Laser
KW - Oxide
KW - Perovskite
KW - Oxides
KW - Fluorescence
KW - Infrared
KW - Infrared spectroscopy
KW - Computer simulation
KW - Article
KW - Image enhancement
KW - Titanium
KW - Instrumentation
KW - Calcium compounds
KW - Calcium derivative
KW - Molecular Imaging
KW - Optical instrumentation
KW - Scanning near field optical microscopy
KW - Superlens
KW - Infrared spectrophotometry
KW - Lenses
KW - Spectrophotometry
AU - S.C Kehr
AU - Y.M Liu
AU - L.W Martin
AU - P Yu
AU - M Gajek
AU - S.-Y Yang
AU - C.-H Yang
AU - M.T Wenzel
AU - R Jacob
AU - H.-G von Ribbeck
AU - M Helm
AU - X Zhang
AU - L.M Eng
AU - Ramamoorthy Ramesh
AB - A planar slab of negative-index material works as a superlens with sub-diffraction-limited resolution, as propagating waves are focused and, moreover, evanescent waves are reconstructed in the image plane. Here we demonstrate a superlens for electric evanescent fields with low losses using perovskites in the mid-infrared regime. The combination of near-field microscopy with a tunable free-electron laser allows us to address precisely the polariton modes, which are critical for super-resolution imaging. We spectrally study the lateral and vertical distributions of evanescent waves around the image plane of such a lens, and achieve imaging resolution of Î /14 at the superlensing wavelength. Interestingly, at certain distances between the probe and sample surface, we observe a maximum of these evanescent fields. Comparisons with numerical simulations indicate that this maximum originates from an enhanced coupling between probe and object, which might be applicable for multifunctional circuits, infrared spectroscopy and thermal sensors. © 2011 Macmillan Publishers Limited. All rights reserved.
BT - Nature Communications
DO - 10.1038/ncomms1249
LA - eng
M1 - 1
N1 - cited By 61
N2 - A planar slab of negative-index material works as a superlens with sub-diffraction-limited resolution, as propagating waves are focused and, moreover, evanescent waves are reconstructed in the image plane. Here we demonstrate a superlens for electric evanescent fields with low losses using perovskites in the mid-infrared regime. The combination of near-field microscopy with a tunable free-electron laser allows us to address precisely the polariton modes, which are critical for super-resolution imaging. We spectrally study the lateral and vertical distributions of evanescent waves around the image plane of such a lens, and achieve imaging resolution of Î /14 at the superlensing wavelength. Interestingly, at certain distances between the probe and sample surface, we observe a maximum of these evanescent fields. Comparisons with numerical simulations indicate that this maximum originates from an enhanced coupling between probe and object, which might be applicable for multifunctional circuits, infrared spectroscopy and thermal sensors. © 2011 Macmillan Publishers Limited. All rights reserved.
PY - 2011
T2 - Nature Communications
TI - Near-field examination of perovskite-based superlenses and superlens-enhanced probe-object coupling
VL - 2
SN - 20411723
ER -