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Patterning via Optical Saturable Transitions - Fabrication and Characterization

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Published on: December 11, 2014

Reconfigurable Mechanochromic Patterns into Chameleon-Inspired Photonic Papers.

Dongpeng Yang¹, Yang Hu¹, Dekun Ma²

¹School of Materials and Energy, Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Guangdong University of Technology, Guangzhou 510006, China.

Research (Washington, D.C.)

|August 12, 2022

Summary

Researchers developed reconfigurable photonic crystal (PC) patterns using phase change material (PCM) ink on PC paper. These chameleon-inspired patterns offer multicolor, high-resolution, and reversible mechanochromic properties for optical devices and anticounterfeiting applications.

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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Published on: February 27, 2019

Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Photonic crystals (PCs) are crucial for optical devices, but pattern reconfiguration remains challenging.
Existing PC fabrication methods lack flexibility for dynamic pattern changes.

Purpose of the Study:

To present a novel strategy for reconfigurable photonic crystal patterns.
To develop self-recordable PC patterns with mechanochromic properties.

Main Methods:

Utilized phase change material (PCM) as ink for printing patterns onto chameleon-inspired PC papers.
Demonstrated pattern reconfiguration via printing and erasure in ethanol.
Investigated mechanochromic properties of the resulting photonic patterns.

Main Results:

Achieved multicolor and high-resolution (25 µm dots, 75 µm lines) reconfigurable PC patterns.
Exhibited programmable and reversible color changes under pressure due to mechanochromic characteristics.
Identified key factors: high melting point ink, non-closely packed PC paper, and similar solubility parameters.

Conclusions:

The developed method offers a simple, flexible, and efficient way to reconfigure PC patterns.
The PC patterns exhibit tunable mechanochromic properties, enabling novel applications.
This work paves the way for advanced anticounterfeiting and optical devices operated by hand.