Publication Type:Journal Article
Source:Optical Materials Express, Volume 1, Number 5, p.1051-1060 (2011)
Keywords:Broad frequency range, Different frequency, Electrical engineering, Evanescent fields, Field distribution, Image contrasts, magnetic materials, Micro spectroscopy, Near field microscopy, Perovskite, Scattering and absorption, Superlenses, Superlensing
Superlenses create sub-diffraction-limit images by reconstructing the evanescent fields arising from an object. We study the lateral, vertical, and spectral field distribution of three different perovskite-based superlenses by means of scattering-type near-field microscopy. Subdiffraction-limit resolution is observed for all samples with an image contrast depending on losses such as scattering and absorption. For the three lenses superlensing is observed at slightly different frequencies resulting in an overall broad frequency range of 3.6 THz around 20 THz. © 2011 Optical Society of America.
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