الفهرس 
Chapter (1) IntroductionOnly 14 pages are availabe for public view
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Abstract
In this thesis, A novel design of circular photonic crystal fiber (C-PCF) gas sensor is presented and analyzed by full vectorial finite element method. The suggested structure has a spiral porous core region to achieve high light interaction with the applied gas. The geometrical parameters of the proposed sensor are studied to achieve high sensor sensitivity. The introduced C-PCF offers high relative sensitivity of 72.04 % at a wavelength of 1.33 µm. The reported gas sensor also offers a compact, accurate and useful tool for detecting harmful gases over a wide transmission band from wavelength of 1 µm to 1.8 µm.