Single‐Stimulus‐Induced Modulation of Multiple Optical Properties
- 18 April 2019
- journal article
- research article
- Published by Wiley in Advanced Materials
- Vol. 31 (23), e1900388
- https://doi.org/10.1002/adma.201900388
Abstract
Stimuli‐responsive smart optical materials hold great promise for applications in active optics, display, sensing, energy conversion, military camouflage, and artificial intelligence. However, their applications are greatly restricted by the difficulty of tuning different optical properties within the same material, especially by a single stimulus. Here, magnetic modulations of multiple optical properties are demonstrated in a crystalline colloidal array (CCA) of magnetic nanorods. Small‐angle X‐ray scattering studies reveal that these nanorods form an unusual monoclinic crystal in concentrated suspensions. The CCA exhibits optical anisotropy in the form of a photonic bandgap and birefringence, thus enabling magnetic tuning of the structural color and transmittance at a rate of 50 Hz. As a proof‐of‐concept, it is further demonstrated that the fabrication of a multifunctional device for display, anticounterfeiting, and smart‐window applications based on this multiple magneto‐optical effect. The study not only provides a new model system for understanding colloidal assembly, but also opens up opportunities for new applications of smart optical materials for various purposes.Keywords
Funding Information
- Natural Science Foundation of Jiangsu Province (BK20160309, 1601042C)
- National Natural Science Foundation of China (51802208, 51821002, 91833303, 51772200)
- China Postdoctoral Science Foundation (2017M611893)
- Project 211
- Ontario Ministry of Research, Innovation and Science
- Ministero dello Sviluppo Economico
- Natural Sciences and Engineering Research Council of Canada
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