A novel evanescent field optical fiber sensor based on a solid-core photonic crystal fiber with large holes has been introduced and successfully fabricated. Experiments show that the ethanol solution of unit concentration causes 0.461dB attenuation of absorbance. The finite element numerical simulation of the grapefruit photonic crystal fiber has been performed. The energy overlap factor is 0.0039 when holes are filled with air, and that is 0.012 when holes are filled with water for the different effective refractive index of the holes. Besides, the relationship between the maximum power transmission and the refractive index is also studied and analyzed. This research provides helpful instructions to the study of evanescent field sensing based on the solid-core photonic crystal fiber with large holes especially for biochemical detection.
