Research Of Multifunctional Photonic Crystal Systems Based On Chemical Reaction

Photonic crystal is a class of materials with periodic dielectric constant. The intrinsic periodicity allows tuning of the passage of light, which contributes to its unique property of photonic bandgap. As the unique optical properties of photonic crystal rise from its inner structure, it is endowed with the mighty ability of signal self-reporting, which ensures its vast applications in optical control, chemical sensing and bioengineering.The photonic structure together with its optical properties promote photonic crystal to be a universal platform, which could combine a large variety of functional materials.The combination of photonic crystal with chemical reaction is the recent hotspot of research. The variety of chemical reaction enriches the application of photonic crystal and its extendibility. With the coherent combination of chemical reaction and photonic crystal, it is promising to develop novel multi-functional materials.The research in this thesis mainly focuses on several chemical reactions and their contribution to develop photonic-based novel materials. The maleimide-thio reaction is first studied to develop a highly sensitive sensing platform for the activity of acetylcholinesterase. The approach owns remarkably low limit of detection, and is also promising for its facile manipulation and bare-eye observation, which is highly potent in real applications. Besides, a patterning approach for inverse opal material is developed, based on the selective deprotection-modification approach of photolabile polymer. Such method owns the advantage of facile manipulation and high selectivity, compared with cumbersome physical modification. More important, 2D pattern with chemical complexity is developed. The deprotection-modification approach can be further applied to fabricate complex systems, including hydrophilicity gradient or dynamic chemical pattern for anticounterfeiting materials. More interestingly, taking advantage of the diffusive etching of photonic microbeads, an alternative approach of fabricating 3D chemical complexity was approached, based on the etch-reaction process. The spatial anisotropy and optical properties of photonic crystal can emerge novel functional systems, including 3D hydrophilicity gradient, chemoorthogonal reaction platform as well as cascade enzyme reaction system with dual output.This thesis follows the routine of studying the combination of chemical reaction and photonic crystal, from isotropic material, to 2D and eventually 3D anisotropic complex photonic crystal material. The research proved that the combination of chemical reaction with photonic crystal is highly promising for both variety and extendibility. It is hopeful that more complex functional systems can be developed on the basis of this study.