Construction And Application Of PEGDA-based Responsive Photonic Crystals

Photonic crystals are a new kind of materials formed by the periodic arrangement of media with different refractive index.However,as for traditional photonic crystals,their periodic structure is fixed and it is difficult to reversibly regulate the photonic band gap.Responsive photonic crystal is a new type of material with responsive microstructure obtained by combining the two scientific fields of responsive polymer and photonic crystal.Its structure can be deformed under the action of external stimulus to change the microscopic ordered structure of photonic crystal.Since responsive photonic crystals are structurally responsive,their photonic band gaps can also be regulated by external stimuli.In this paper,opal photonic crystal templates were constructed using SiO₂,antiopal photonic crystals with thermal and near-infrared light response were prepared by using the template removal method after filling the precursor liquid of polymer monomer,and the applications of materials in the fields of information storage and pattern display were discussed.Firstly,thermal response photonic crystals of polyethylene glycol（600）diacrylate（PEGDA）and aliphatic polyurethane acrylate（PUA）were prepared.The photonic crystal has the properties of pressure compilation and temperature trigger recovery.After doping fluorescent dyes into the photonic crystals,it was found that the photonic crystals had an inhibitory effect on the luminous intensity of the dyes,which reached 83%,and the inhibitory effect could be reversibly regulated through pressure and temperature control.After pattern embossing on the material surface,multiple patterns were observed under natural light and fluorescence conditions.Secondly,this paper doped a series of nir absorption reagents into PEGDA-co-PUA photonic crystal system to prepare the photonic crystal with nir light responsive.The photonic crystal has the performance of pressure compilation and near-infrared light trigger recovery,and its structure can collapse under pressure and remain stable under this deformation state.After 980 nm laser irradiation,it can return to the original state,realizing the reversible transformation of photonic crystal structure between orderly and deformation state.Moreover,the material surface can be repeatedly written and erased by laser writing and stamp embossing,realizing a two-way erasable performance.The photonic crystal responds to the"non-contact"external stimulus of light,which expands the application of materials in the fields of advanced optical devices and information storage.Finally,thermal response photonic crystals of isoborneol acrylate（IBOA）and polyethylene glycol（600）diacrylate（PEGDA）were prepared.Under the action of tensile force,the structure of the photonic crystal can be deformed and stabilized in multiple deformation states.After heating,the structure of the photonic crystal can be restored to the original state,realizing the structural reconstruction among multiple stable structures.After doping the photonic crystals with fluorescent dyes,the photonic crystals under different deformation conditions can realize multiple regulation of the luminescence intensity of the fluorescent dyes,with the maximum inhibition effect reaching 63%.After patterned and micropatterned on the surface of materials,the multiple micropatterns with a clear boundary and strong contrast with an accuracy of 100 microns were observed under optical microscope and fluorescence microscope.