Tunable rainbow light trapping in ultrathin resonator arrays

Katelyn Dixon; Arthur O. Montazeri; Moein Shayegannia; Edward S. Barnard; Stefano Cabrini; Naomi Matsuura; Hoi-Ying Holman; Nazir P. Kherani

doi:10.1038/s41377-020-00428-y

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Tunable rainbow light trapping in ultrathin resonator arrays

Original Articles

- Tunable rainbow light trapping in ultrathin resonator arrays
- Light: Science & Applications Vol. 9, Issue 6, Pages: 1974-1982(2020)
- Affiliations：
  
  1.Department of Electrical & Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada
  2.Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, CA 94720, USA
  3.Department of Materials Science & Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada
- Author bio：
  
  Nazir P. Kherani (nazir.kherani@utoronto.ca)
- Funds：
- DOI：10.1038/s41377-020-00428-y
  CLC：
- Published：2020，
  
  Published Online：26 November 2020，
  
  Received：28 March 2020，
  
  Revised：22 September 2020，
  
  Accepted：05 November 2020
- Accepted：
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Dixon, K. et al. Tunable rainbow light trapping in ultrathin resonator arrays. Light: Science & Applications, 9, 1974-1982 (2020).
DOI：

Dixon, K. et al. Tunable rainbow light trapping in ultrathin resonator arrays. Light: Science & Applications, 9, 1974-1982 (2020). DOI： 10.1038/s41377-020-00428-y.

摘要

Abstract

Rainbow light trapping in plasmonic devices allows for field enhancement of multiple wavelengths within a single device. However

many of these devices lack precise control over spatial and spectral enhancement profiles and cannot provide extremely high localised field strengths. Here we present a versatile

analytical design paradigm for rainbow trapping in nanogroove arrays by utilising both the

groove-width and groove-length as tuning parameters. We couple this design technique with fabrication through multilayer thin-film deposition and focused ion beam milling

which enables the realisation of unprecedented feature sizes down to 5 nm and corresponding extreme normalised local field enhancements up to 10

. We demonstrate rainbow trapping within the devices through hyperspectral microscopy and show agreement between the experimental results and simulation. The combination of expeditious design and precise fabrication underpins the implementation of these nanogroove arrays for manifold applications in sensing and nanoscale optics.

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Keywords

references

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