Gas sensing by using volume fraction of adsorption in photonic crystals

Generally, photonic bandgap (PBG) would shift when photonic crystals (PCs) are exposed to different surrounding conditions. Thus, the shift of PBG could be used to study the adsorption behavior of gas on the surface of PCs. However, the amount of PBG shift only contains finite information about analyte which could cause the change of structural parameters of PCs. In this paper, we have deduced the volume fraction of adsorption vapor (Vvap) in silica PCs to quantitatively explain the effect of target gases on adsorption behavior according to Replacing model based on our previous research. In this work, the effect of volume fraction of void in silica PCs and types of target gases on gas adsorption behavior has been discussed by using Vvap.