| Autor: |
Kehr SC; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. sck21@st-andrews.ac.uk, Liu YM, Martin LW, Yu P, Gajek M, Yang SY, Yang CH, Wenzel MT, Jacob R, von Ribbeck HG, Helm M, Zhang X, Eng LM, Ramesh R |
| Jazyk: |
angličtina |
| Zdroj: |
Nature communications [Nat Commun] 2011; Vol. 2, pp. 249. |
| DOI: |
10.1038/ncomms1249 |
| Abstrakt: |
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 λ/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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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