Design of Simple Structure Gas Sensor Based on Hybrid Photonic Crystal Fiber

A hybrid structure photonic crystal fiber gas sensor is presented in this paper to detect toxic and colorless gases. The guiding properties of proposed structure have been numerically investigated using finite element method (FEM). From the numerical results sensitivity of the proposed structure is enhanced to 15.67%. The Confinement loss or Leakage loss decreased to 1.12×10-7 by acquainting an octagonal ring of air holes in the outer cladding. The proposed H-PCF can be used in a wider range of wavelength from 0.8µm to 2 µm. The proposed structure has significantly lower confinement losses, higher sensitivity and is more flexible for its simplicity compared with early proposed PCFs.