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Updated: Jun 5, 2025

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy

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Published on: June 5, 2019

Encoding Mie, plasmonic, and diffractive structural colors in the same pixel.

Youngji Kim¹, Jerome K Hyun¹

¹Department of Chemistry and Nanoscience, Ewha Womans University, Seoul, 03760, Republic of Korea.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

This study introduces a novel structural color design using Mie, plasmonic, and diffractive effects for advanced data storage and encryption. The multi-mechanism pixel enables four information layers, viewable under specific optical conditions.

Keywords:

Mie resonance diffraction multi-level encryption plasmonic resonance structural color

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Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Structural color designs offer tunable optical properties.
Integrating multiple optical mechanisms within a single pixel presents a challenge.
Existing methods often lack multi-layered information encoding capabilities.

Purpose of the Study:

To develop a 1D reflective multi-level structural color design.
To integrate Mie, plasmonic, and diffractive optical mechanisms into a single pixel.
To demonstrate multi-layered information encoding and retrieval for data security applications.

Main Methods:

Fabrication of a metallodielectric grating using TiO_x nanowires and Ag thin films.
Utilizing polarization-dependent Mie and localized plasmonic resonances for color generation.
Leveraging grating diffraction and numerical aperture control for additional color states and information retrieval.

Main Results:

The design exhibits distinct color states based on Mie resonance, plasmonic resonance, and diffraction.
Color states are modulated by incident light polarization and objective lens numerical aperture.
Four distinct layers of information were successfully encoded and retrieved from a pixel array.

Conclusions:

The integrated multi-mechanism structural color design enables versatile optical responses.
This technology provides a novel platform for high-density data storage and encryption.
The findings open new avenues for anticounterfeiting technologies and secure information management.