27 April 2016 Spatial frequency characterisation of a far-field superlens to facilitate general purpose imaging
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Abstract
Based on sub-wavelength energy concentration and enhancement of evanescent fields, far-field super-lenses (FSLs) were proposed recently as a means to achieve super-resolution imaging and thus improve the accuracy and resolution of optical microscopy. Comprised of a thin-film plasmonic enhancement layer and a diffraction grating, the performance of FSLs depends greatly on the geometry and size of its constituent parts. In this paper, we aim to characterize the resolution capabilities of FSLs in a novel and meaningful way, while also exploring the effects of non-ideal grating geometries due to fabrication limitations on imaging performance. We use finite element modelling to explore trapezoidal, inverse-trapezoidal, circular, rounded rectangular, and rectangular grating profiles and present a transfer function that quantifies the performance of these grating profiles in terms of their transmission at different wavenumbers.
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Farzaneh Fadakar Masouleh, Farzaneh Fadakar Masouleh, Paul Teal, Paul Teal, Ciaran Moore, Ciaran Moore, "Spatial frequency characterisation of a far-field superlens to facilitate general purpose imaging", Proc. SPIE 9889, Optical Modelling and Design IV, 98890I (27 April 2016); doi: 10.1117/12.2227923; https://doi.org/10.1117/12.2227923
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