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A polychromatic approach to far-field superlensing at visible wavelengths

Author

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  • Fabrice Lemoult

    (Institut Langevin, ESPCI ParisTech and CNRS)

  • Mathias Fink

    (Institut Langevin, ESPCI ParisTech and CNRS)

  • Geoffroy Lerosey

    (Institut Langevin, ESPCI ParisTech and CNRS)

Abstract

Breaking the diffraction barrier in the visible part of the electromagnetic spectrum is of fundamental importance. Far-field subwavelength focusing of light could, for instance, drastically broaden the possibilities available in nanolithography, light-matter interactions and sensing at the nanoscale. Similarly, imaging with a nanometric resolution could result in incredible breakthroughs in soft matter and biology. There have been numerous proposals in this regard based on metamaterials, structured illumination methods or diffractive optical components. The common denominator of all these approaches resides in their monochromatic nature. Here we show that using polychromatic light in dispersive metamaterials allows us to circumvent many limitations associated with previous monochromatic approaches. We design a plasmonic metalens based on metallic nanorods that, when used with broadband light fields, can beat the diffraction limit for imaging and focusing from the far field.

Suggested Citation

  • Fabrice Lemoult & Mathias Fink & Geoffroy Lerosey, 2012. "A polychromatic approach to far-field superlensing at visible wavelengths," Nature Communications, Nature, vol. 3(1), pages 1-8, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1885
    DOI: 10.1038/ncomms1885
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