21 February 2013 Wetting in color: from photonic fingerprinting of liquids to optical control of liquid percolation
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We provide an overview of our recent advances in the manipulation of wetting in inverse-opal photonic crystals. Exploiting photonic crystals with spatially patterned surface chemistry to confine the infiltration of fluids to liquidspecific spatial patterns, we developed a highly selective scheme for colorimetry, where organic liquids are distinguished based on wetting. The high selectivity of wetting, upon-which the sensitivity of the response relies, and the bright iridescent color, which disappears when the pores are filled with liquid, are both a result of the highly symmetric pore structure of our inverse-opal films. The application of horizontally or vertically orientated gradients in the surface chemistry allows a unique response to be tailored to specific liquids. While the generic nature of wetting makes our approach to colorimetry suitable for applications in liquid authentication or identification across a broad range of industries, it also ensures chemical non-specificity. However, we show that chemical specificity can be achieved combinatorially using an array of indicators that each exploits different chemical gradients to cover the same dynamic range of response. Finally, incorporating a photo-responsive polyelectrolyte surface layer into the pores, we are able to dynamically and continuously photo-tune the wetting response, even while the film is immersed in liquid. This in situ optical control of liquid percolation in our photonic-crystal films may also provide an error-free means to tailor indicator response, naturally compensating for batch-to-batch variability in the pore geometry.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ian B. Burgess, Ian B. Burgess, Bryan A. Nerger, Bryan A. Nerger, Kevin P. Raymond, Kevin P. Raymond, Alexis Goulet-Hanssens, Alexis Goulet-Hanssens, Thomas A. Singleton, Thomas A. Singleton, Mackenzie H. Kinney, Mackenzie H. Kinney, Anna V. Shneidman, Anna V. Shneidman, Natalie Koay, Natalie Koay, Christopher J. Barrett, Christopher J. Barrett, Marko Lončar, Marko Lončar, Joanna Aizenberg, Joanna Aizenberg, "Wetting in color: from photonic fingerprinting of liquids to optical control of liquid percolation", Proc. SPIE 8632, Photonic and Phononic Properties of Engineered Nanostructures III, 863201 (21 February 2013); doi: 10.1117/12.2013366; https://doi.org/10.1117/12.2013366

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