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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

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Plasmochromic Nanocavity Dynamic Light Color Switching.

Eric Hopmann¹, Abdulhakem Y Elezzabi¹

¹Ultrafast Optics and Nanophotonics Laboratory, Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada.

|February 13, 2020

Summary

This study demonstrates active spectral color control in plasmonic metal-insulator-nanohole (MIN) cavities using electrochromic tungsten oxide (WO3). The tunable MIN cavities achieve a 64 nm wavelength shift with high reproducibility and stability for advanced display applications.

Keywords:

Active Plasmonics Electrochromics Plasmochromics Plasmonic Colorprinting Sustainability

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Area of Science:

Plasmonics
Nanophotonics
Materials Science

Background:

Plasmonic metal-insulator-nanohole (MIN) cavities produce high chromaticity spectral colors for displays.
Active control over spectral color in single MIN cavities remains a challenge.

Purpose of the Study:

To introduce active spectral color tuning in MIN cavities using electrochromic materials.
To investigate the use of tungsten oxide (WO3) as a tunable dielectric in MIN devices.

Main Methods:

Incorporation of inorganic, electrochromic WO3 as the tunable dielectric layer within a MIN nanocavity.
Utilizing a plasmonic superstructure for well-defined spectral reflection.
Electrochemical characterization to assess stability and performance.

Main Results:

Achieved theoretical resonance wavelength modulation from 601 to 505 nm.
Experimentally demonstrated a 64 nm peak wavelength shift with high reflectance intensity (35%) and reproducibility.
Observed electrochemical stability over 100 switching cycles with 91.1% charge recovery and low power consumption (5.6 mW/cm-2).

Conclusions:

Electrochromic WO3 enables active, tunable spectral color control in MIN nanocavities.
The developed device offers a promising solution for dynamic color generation in display technologies.
The MIN cavities exhibit excellent stability, reproducibility, and energy efficiency.