At-will chromatic dispersion by prescribing light trajectories with cascaded metasurfaces

Andrew McClung; Mahdad Mansouree; Amir Arbabi

doi:10.1038/s41377-020-0335-7

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At-will chromatic dispersion by prescribing light trajectories with cascaded metasurfaces

Original Articles

- At-will chromatic dispersion by prescribing light trajectories with cascaded metasurfaces
- Light: Science & Applications Vol. 9, Issue 4, Pages: 991-999(2020)
- Affiliations：
  
  Department of Electrical and Computer Engineering, University of Massachusetts Amherst, 151 Holdsworth Way, Amherst, MA 01003, USA
- Author bio：
  
  Amir Arbabi (arbabi@umass.edu)
- Funds：
- DOI：10.1038/s41377-020-0335-7
  CLC：
- Published：2020，
  
  Published Online：27 May 2020，
  
  Received：27 January 2020，
  
  Revised：10 May 2020，
  
  Accepted：12 May 2020
- Accepted：
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Andrew, M. C., Mahdad M., & Amir A. et al. At-will chromatic dispersion by prescribing light trajectories with cascaded metasurfaces. Light: Science & Applications, 9, 991-999 (2020).
DOI：

Andrew, M. C., Mahdad M., & Amir A. et al. At-will chromatic dispersion by prescribing light trajectories with cascaded metasurfaces. Light: Science & Applications, 9, 991-999 (2020). DOI： 10.1038/s41377-020-0335-7.

摘要

Abstract

Chromatic dispersion spatially separates white light into colours

producing rainbows and similar effects. Detrimental to imaging but essential to spectroscopy

chromatic dispersion is the result of material properties in refractive optics and is considered an inherent characteristic of diffractive devices such as gratings and flat lenses. Here

we present a fundamental relation connecting an optical system's dispersion to the trajectories light takes through it and show that arbitrary control over dispersion may be achieved by prescribing specific trajectories

even in diffractive systems. Using cascaded metasurfaces (2D arrays of sub-micron scatterers) to direct light along predetermined trajectories

we present an achromatic twisted metalens and experimentally demonstrate beam deflectors with arbitrary dispersion. This new insight and design approach usher in a new class of optical systems with wide-ranging applications.

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Keywords

references

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