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Enhancing Plasmonic Spectral Tunability with Anomalous Material Dispersion.

Mengjie Zheng1,2,3, Yi Yang3, Di Zhu3,4

  • 1College of Mechanical and Vehicle Engineering, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, 410082 Changsha, China.

Nano Letters
|December 21, 2020
PubMed
Summary

Anomalous dispersion materials like Germanium (Ge) significantly enhance spectral tunability in plasmonic systems. This breakthrough improves applications like sensors and color displays, offering a three-fold increase in tunability compared to normal dispersion materials.

Keywords:
anomalous dispersioncolor displaymetasurfacesplasmonicsspectral tunability

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Area of Science:

  • Plasmonics and Nanophotonics
  • Materials Science
  • Optical Engineering

Background:

  • Plasmonic systems offer tunable spectral properties crucial for nanorulers, sensors, and color displays.
  • Spectral tunability is typically achieved through structural changes or environmental factors.

Purpose of the Study:

  • To investigate and demonstrate the enhanced spectral tunability of plasmonic systems using materials with anomalous dispersion.
  • To explore Germanium (Ge) as a material for improving spectral tunability in plasmonic resonators.

Main Methods:

  • Utilized Ge-based film (Ag/Au)-coupled gap plasmon resonators in two distinct architectures.
  • Employed single-particle dark-field scattering, ensemble reflection, and structural color generation for characterization.

Main Results:

  • Observed a three-fold enhancement in spectral tunability using Ge nanodisks compared to Silicon (Si) nanodisks.
  • Demonstrated wide gamut structural color generation using large arrays of Ge-Ag resonators.

Conclusions:

  • Anomalous material dispersion, exemplified by Ge, provides an additional parameter for engineering plasmonic system tunability.
  • This finding is particularly relevant for developing actively tunable plasmonics and advanced metasurfaces.