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Tunable multiband metasurfaces by moiré nanosphere lithography.

Zilong Wu1, Kai Chen2, Ryan Menz1

  • 1Department of Mechanical Engineering, Materials Science and Engineering Program, and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA. zheng@austin.utexas.edu.

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Moiré nanosphere lithography creates tunable metasurfaces with multiple plasmon modes. These nanostructures offer broadband optical responses for advanced spectroscopy and absorption applications.

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Area of Science:

  • Plasmonics and Nanophotonics
  • Materials Science
  • Optical Engineering

Background:

  • Moiré nanosphere lithography (MNSL) offers a cost-effective method for fabricating complex nanostructures on various substrates.
  • Self-assembled nanosphere layers with controlled in-plane rotation enable precise moiré pattern generation.

Purpose of the Study:

  • To experimentally and numerically investigate moiré metasurfaces fabricated using MNSL.
  • To analyze the plasmonic properties and optical responses of these engineered nanostructures.
  • To explore the potential applications of moiré metasurfaces in spectroscopy and absorption.

Main Methods:

  • Utilized Moiré nanosphere lithography (MNSL) for fabricating gradient plasmonic nanostructures.
  • Performed experimental characterization of optical spectra and near-field electromagnetic distributions.
  • Conducted numerical simulations to analyze localized surface plasmon (LSP) and plasmonic gap modes.

Main Results:

  • Demonstrated that single moiré metasurfaces support multiple LSP modes with resonant wavelengths from ~600 nm to ~4200 nm.
  • Identified the origins of LSP modes through optical spectra and near-field analysis.
  • Fabricated metasurfaces with nanogap structures exhibiting significant field enhancements and tunable multiband optical responses.

Conclusions:

  • Moiré metasurfaces exhibit tunable multiband optical responses across visible, near-infrared, and mid-infrared regimes.
  • These metasurfaces are suitable for applications such as ultrabroadband absorbers and advanced spectroscopic techniques.
  • The MNSL approach provides a versatile platform for designing functional plasmonic nanostructures.