Hydrogel-Assisted Dissociation And Optical Performances Of Colloidal-Crystal Derived Three-dimensional Microstructures

In recent years, photonic crystals and metal plasmon nanophotonic structures are continuous research and development due to the unique ability of interactions between light and matter, and gradually applied in many fields of biological sensing, material testing, new light source etc. However, in the present study, combination of the above two kinds of nanophotonic structures, plasmon crystals are still many limitations to be one-dimensional or two-dimensional structure, there are also some limitations. Therefore, when we study the metal plasmon, the unique technology of hydrogel assisted dissociation is used to dissociate controllably three-dimensional ordered structure and put forward a new effective way for study of three dimensional metal plasmon crystal structure. In this paper, two different shapes of metal lasmon rystal structure are successfully prepared by this method and studied the related optical properties by electromagnetic simulation combined with experiments.As a foundation, we prepare inverse opal structures of metal nickel, silver and Zinc Oxide by used the method of colloidal crystal template assisted electrochemical deposition. And again to Zinc Oxide inverse opal structure as template, successfully obtained opal structure of nickel. By separately using polarizing microscopy and scanning electron microscopy (SEM) to characterize the structure, effectively demonstrates the uniformity, integrity and periodicity for three-dimensional ordered structure.We use the PHEMA hydrogel filled to the metal structure of ordered three-dimensional in order to achieve the structure assisted dissociation. When the structure of the hydrogel complete polymerization, used the methods of electrochemical polishing corrosion dissociation of metal structure. In this process, structure of the hydrogel completely does not hinder the exchange of ions in solution. And when the metal structure is broken, can play a good supporting effect, thus prepared two different shapes of metal Plasmon crystal structure. Scanning electron microscopy of electrochemical polishing process was characterized, clearly see the metal structure from continuous to discontinuous process.We measured spectral reflectance and transmittance spectra of the test sample through the spectral measurement system and absorption spectrometer while using FDTD Solution software simulate and analyze the structure of the various experiments performed. By comparing the theoretical and experimental results, it is well verify that the spectral characteristics of three-dimensional metal/dielectric crystals plasmon. And by comparing the samples of the different polishing degrees, different templates particle size, concentration of different hydrogels, in-depth researched the characteristic spectral peaks and offset of Metal structures of different shapes.