Three-dimensional photonic crystal sensors

Yun-Ju Lee; Paul V. Braun

doi:10.1117/12.509365

24 November 2003 Three-dimensional photonic crystal sensors

Yun-Ju Lee, Paul V. Braun

Proceedings Volume 5224, Nanomaterials and Their Optical Applications; (2003) https://doi.org/10.1117/12.509365
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

Photonic crystal templating of optically active hydrogel sensors is a topic of growing interest in materials chemistry. When interactions between a mesostructured hydrogel and the analyte molecules cause a reversible dimensional change of the hydrogel, the corresponding change in optical diffraction can be detected either spectroscopically or visually. Using poly(styrene) photonic crystals as templates, we synthesized inverse opal hydrogels through photopolymerization of 2-hydroxyethylmethacrylate and various functional monomers, and demonstrated the ability to sense pH and glucose at different ionic strengths and other experimental conditions. The diffraction of the pH sensitive hydrogel shifted from 544 nm to 850 nm when the pH was increased from 4 to 7, while the diffraction of the glucose sensitive hydrogel changed from 599 nm to 719 nm when the glucose concentration was raised from 0 mM to 100 mM. Diffraction response kinetics on the order of ~30 minutes were observed, which may be attributed to diffusion of analyte molecules through thin (12 - 24 μm) hydrogel samples. These mechanically robust inverse opal hydrogel sensors may form a starting point for chemical and biological sensing using diffractive three-dimensional mesostructures.

Citation Download Citation

Yun-Ju Lee and Paul V. Braun "Three-dimensional photonic crystal sensors", Proc. SPIE 5224, Nanomaterials and Their Optical Applications, (24 November 2003); https://doi.org/10.1117/12.509365

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