Enhancement of chemical sensing capability in a photonic crystal fiber with a hollow high index ring defect at the center

摘要: A new type of index-guided photonic crystal fiber is proposed to enhance chemical sensing capability by introducing a hollow high index ring defect that consists the central air hole surrounded GeO2 doped SiO2 glass ring. Optical properties fundamental guided mode were numerically analyzed using full-vector finite element method varying design parameters both defects in center and hexagonal air-silica lattice cladding. Enhanced evanescent wave interaction holey region lower confinement loss an order magnitude achieved simultaneously, which shows potential hyper sensitive fiber-optic applications.