Study on Tunable Filtering Characteristic of 1-D defect Photonic Crystal Based on Surface Wave Resonance

A optical biosensor used in index dynamic detection has been proposed combining the tunable filtering characteristics of defect photonic crystal with the surface wave resonance principle. The sensing model of the biosensing chip based on defect photonic crystal has been established based on rigid coupled wave method, which obtained the relationship between the change of resonant angle for reflective spectrum and the variation of refractive index for biomolecule detected. Using the photonic crystal with the defect layer in place of the metal film in the surface plasma resonance(SPR) sensor, repeatedly total reflection would take place in the defect layer, which would increase the senstivity of the measurement system.