16 May 2011 Beating the diffraction limit using a 3D nanowires metamaterials nanolens
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Super-resolution imaging using a three-dimensional metamaterials nanolens has been recently reported [B. D. F. Casse et al. Appl. Phys. Lett. 96, 023114 (2010)]. This nanolens, consisting of bulk gold nanowires embedded in alumina template, can transport with low-loss object details down to λ/4 (λ, wavelength) length scales, over significant distances of the order of 6λ. Here, we present validation of the super-resolution imaging by the nanolens through extensive control experiments. We also analytically show that the nanowire array medium supports a quasi transverse electromagnetic mode (TEM) with flat isofrequency contours, which is a requirement for super-resolution imaging. We numerically compute the optical transfer function to quantify the imaging quality of the lens and show that the theoretical resolution of this nanolens is λ/5. Additionally, we demonstrate the broadband nature of the lens in the spectral region 1510 nm to 1580 nm. Finally, imaging of a large object (~ 52λ in diameter), with subwavelength features, is presented.
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B. D. F. Casse, Y. J. Huang, W. T. Lu, E. Gultepe, L. Menon, S. Sridhar, "Beating the diffraction limit using a 3D nanowires metamaterials nanolens", Proc. SPIE 8034, Photonic Microdevices/Microstructures for Sensing III, 803407 (16 May 2011); doi: 10.1117/12.883699; https://doi.org/10.1117/12.883699

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