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Sensing characteristics of the gold-silver alloy waveguided metallic photonic crystals

The waveguided metallic photonic crystal biosensor based on gold-silver alloy material is expected to achieve better sensing sensitivity than the same structure of pure gold. By using the gold-silver alloy nanoparticles as “building block”, we successfully assemble one-dimensional waveguided metallic photonic crystals through a solution processible method. This is a simple and low cost method to fabricate one or two dimensional metallic crystals in large area. The sensitivity of the biosensor based on the gold-silver alloy waveguided metallic photonic crystal is 2.5 times that of the same structure made by pure gold. The gold-silver alloy nanoparticles assembled waveguided metallic photonic crystals exhibits potential application in biosensing due to its low-cost and simple testing methods.