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构建以SiO2介质为基底,周期为1000nm的高分子聚合物光子晶体,表面沉积高折射率介质覆层。建立了光子晶体生物传感器反射峰值波长与有效折射率间的关系。采用严格耦合波法(RCWA)理论分析了光子晶体传感器红外窄带反射谱特性,当光子晶体表面吸附介质的浓度变化时,有效折射率随之变化,导致反射峰值波长漂移。因此,可根据光子晶体生物传感器的反射峰值波长的漂移量获得表面吸附介质的分布特性。研究了生物传感器光子晶体表面覆层介质的折射率、厚度和填充比对反射特性和反射峰值波长漂移灵敏度的影响。结果表明,选择合适的覆层参数可提高光子晶体生物传感器的灵敏度。
Based on the SiO2 medium, a polymer photonic crystal with a period of 1000 nm was deposited, and a high refractive index dielectric coating was deposited on the surface. The relationship between the peak reflection wavelength and the effective refractive index of photonic crystal biosensor was established. The characteristic of infrared narrow-band reflection spectrum of photonic crystal sensor is analyzed by RCWA theory. When the concentration of adsorbed medium on the photonic crystal surface changes, the effective refractive index changes, which leads to the shift of peak reflection wavelength. Therefore, the distribution characteristic of the surface adsorption medium can be obtained based on the drift amount of the reflection peak wavelength of the photonic crystal biosensor. The influence of the refractive index, thickness and filling ratio of the biosensor photonic crystal surface coating on the reflection characteristics and the reflection peak wavelength shift sensitivity were studied. The results show that the sensitivity of photonic crystal biosensors can be improved by selecting suitable coating parameters.