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5 October 2015 Adaptable and dynamic soft colloidal photonics (Presentation Recording)
Alexander J. C. Kuehne, Dennis Go
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Proceedings Volume 9564, Light Manipulating Organic Materials and Devices II; 95640P (2015) https://doi.org/10.1117/12.2188012
Event: SPIE Organic Photonics + Electronics, 2015, San Diego, California, United States
Abstract
Existent photonic systems are highly integrated with the active component being completely isolated from the environment as a result of their complex format. There are almost no example for periodic photonic materials, which can interact with their environment by being sensitive to external stimuli while providing the corresponding photonic response. Due to this lack of interaction with the outside world, smart optical components, which are self-healing or adaptable, are almost impossible to achieve. I am going to present an aqueous colloidal system, consisting of core-shell particles with a solid core and a soft shell, bearing both negatively and positively charged groups. The described soft colloids exhibit like charges over a broad range of pH, where they repel each other resulting in a pefect and defect-free photonic crystal. In the absence of a net charge the colloids acquire the arrangement of an amorphous photonic glass. We showcase the applicability of our colloidal system for photonic applications by temporal programming of the photonic system and dynamic switching between ordered and amorphous particle arrangements. We can decrease the pH slowly allowing the particles to transit from negative through neutral to positive, and have them arrange accordingly from crystalline to amorphous and back to crystalline. Thus, we achieve a pre-programmable and autonomous dynamic modulation of the crystallinity of the colloidal arrays and their photonic response. References [1] Go, D., Kodger, T. E., Sprakel, J., and Kuehne, A. J.C. Soft matter. 2014, 10(40), 8060-8065.
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Alexander J. C. Kuehne and Dennis Go "Adaptable and dynamic soft colloidal photonics (Presentation Recording)", Proc. SPIE 9564, Light Manipulating Organic Materials and Devices II, 95640P (5 October 2015); https://doi.org/10.1117/12.2188012
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KEYWORDS
Photonics
Photonic crystals
Crystals
Particles
Photonics systems
Computer programming
Environmental sensing
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