Physics – Optics
Scientific paper
2011-03-25
Nat. Commun. 2:249 (2011)
Physics
Optics
20 pages, 6 figures, published as open access article in Nature Communications (see http://www.nature.com/ncomms/)
Scientific paper
10.1038/ncomms1249
A planar slab of negative index material works as a superlens with sub-diffraction-limited imaging resolution, since 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 wavelength/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.
Eng L. M.
Gajek Martin
Helm Manfred
Jacob Ralf
Kehr Susanne C.
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