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Lattice Transformation-Induced Retroreflective Structural Colors.

Boru Wei¹, Zekun Zhang¹, Dongpeng Yang¹

¹School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, P. R. China.

ACS Applied Materials & Interfaces

|September 28, 2023

Summary

Researchers developed novel strain-responsive retroreflective structural colors using 3D photonic crystals. These colors exhibit unique on/off switching behaviors with strain and rotation, enabling applications in visual strain sensing and anticounterfeiting.

Keywords:

anticounterfeiting lattice transformation retroreflective sensing structural colors

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Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Retroreflective structural colors typically rely on interference, total internal reflection, or diffraction from 2D colloidal arrays.
Existing methods for achieving structural color have limitations in dynamic response and tunability.

Purpose of the Study:

To develop a novel method for generating retroreflective structural colors with dynamic strain responsiveness.
To explore new mechanisms for structural color regulation beyond traditional approaches.

Main Methods:

Fabrication of 3D photonic crystals with non-closely packed long-range order.
Inducing hexagonal-parallelogram lattice transformation through mechanical stretching.
Characterization of optical properties and color switching behaviors under varying strain and rotation.

Main Results:

A new retroreflective structural color was achieved by stretching 3D photonic crystals.
Demonstrated two unique off/on color switches: strain-dependent and angle-dependent.
The colors showed distinct responses to mechanical deformation.

Conclusions:

The study introduces a novel structural color regulation mechanism based on lattice transformation in 3D photonic crystals.
These strain-responsive colors are promising for applications in visual strain sensing (e.g., kinesio tapes) and anticounterfeiting.
The findings open new avenues for advanced optical materials in displays and sensing.