| As a new type of optical material, the production level of photonic crystal has been improvedsignificantly in recent years. High-performance optical components such as photonic crystalmicrocavity, photonic crystal waveguide and photonic crystal fiber sensors are used widely. Thispaper presents a biological sensor based on two-dimensional photonic crystal, which can monitorthe density and changes in the distribution of the object under the test. The proposed photoniccrystal can achieve the "naked eye detection" as other chemical and biological sensors. In addition,it can be reusable with strong anti-interference ability and quick response. The main research is toestablish a mathematical model between the reflection peak wavelength and the refractive index ofthe object under the test. Therefore, the information of density and distribution of the object underthe test can be obtained.Firstly, the paper proposes the structure of the two-dimensional photonic crystal biosensor andanalyses the operation principle use the equivalent medium theory. The relationship between thereflection peak wavelength and refractive index of the medium is obtained. Furthermore, theRigorous Coupled Wave Analysis is used to establish the structural model of two-dimensionalphotonic crystals.Secondly, the reflectance spectra is obtained and analyzed while the density of homogeneousanalyte and random small molecules is changing. The result shows that the two-dimensionalphotonic crystal biosensor structure can detect the concentration and distribution characteristics ofthe object under the test effectively.Finally, the paper analyses the influence on bandgap properties and reflectance spectra of thesensor of the refractive index of the deposited layer, sediment thickness, lattice period, duty cycleand the refractive index of the grating sensor. The results can provide theoretical guidance for thefabrication of photonic crystal. |
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