The Optical Properties And Applications Of Three-dimensional Ag Plasmonic Crystals Fabricated Using Ag Inverse Opals With Low Filling Fractions Or Disconnected Microstructures

In recent years, photonic crystals nanophotonic structures in many areas biosensing, materials testing demonstrated a great potential to bring new vitality to the field of optical sensing, it attracted the attention of many scholars. In the current study, the combination of nanophotonic structures-plasmon crystal is still more to be confined to one-dimensional or two-dimensional structure. Silver has a negative optical frequency dielectric constant and low loss characteristics, while the three-dimensional structure of the inverse opal silver might have properties plasmon photonic band gap, local surface and the like, but is usually limited to high fill rate structure, the light can’t get through the internal structure. Therefore, in this article, the proportion of control by electrochemical polishing silver to give the three-dimensional structure of the inverse opal silver low filling rate, increase translucent three-dimensional structure, obtained while taking advantage of the hydrogel assisted dissociation techniques, successfully prepared a three-dimensional non resonance continuous silver plasmon crystal structure, and enhance the local plasmon response. The main contents include:1. Obtained by electrochemical deposition method of the different sizes of silver, nickel inverse opal, using an electrochemical method of polishing silver, nickel inverse opal structure is etched to obtain a low proportion of silver, nickel inverse opal, with the polishing cycle increase, reducing the proportion of the metal, increasing the translucent three-dimensional structure of the photonic band gap appears. The same particle size, with the increase of the polishing cycle, the PBG position redshift; polishing the same degree, with increasing particle size, photonic bandgap position redshift. Using FDTD model calculated the proportion of low-metallic anti-opal photonic band gap and good penetration, and other locations plasmon peak. And verify that the low proportion of metal inverse opal structure of the optical properties by reflectance spectroscopy experiments and simulations.2. The resultant low filling rate inverse opal silver filling polyacrylamide (PAM), to give Ag-PAM plasmon crystal by scanning electron microscope (SEM) to characterize the structure proved PAM completely wrapped three-dimensional structure; Ag-PAM plasmons in local and crystal surface plasmon peak at different concentrations of alcohol solution with the environment while decreasing the refractive index of blue shift their merit were 9.8,8.09, determine plasma model using FDTD excimer peak position. And by reflectance spectroscopy experiments and simulations to verify the optical properties of Ag-PAM plasmon crystal.3. Silver inverse opal filled poly hydroxyethyl methacrylate (pHEMA), when the hydrogel completely polymerized, using an electrochemical method of polishing its treatment. During polishing, the hydrogel ion exchanged freely. And after breaking the metal structure, the hydrogel can also play a very good supporting role, can be prepared by a three-dimensional structure of a non-continuous silver plasmon crystal. By scanning electron microscopy to characterize the three-dimensional structure of a non-continuous. And using FDTD model of the optical properties of Ag-pHEMA three-dimensional non-continuous structure.