Design of Next Generation Mid-infrared Fiber Optics
Optical fibers that can deliver mid-infrared light in a wide wavelength range are in high demand due to their significant potentials in sensors, chemical imaging, optoelectronics and nonlinear optics applications. Semiconductors such as Ge, ZnSe and Si are good infrared-transparent materials. Using these materials as the fiber cores and silica as the fiber cladding offers opportunities in realizing next-generation mid-infrared multimaterial fiber optics. Optical propagation losses of such structures are simulated using COMSOL Multiphysics® software for different wavelengths and fiber geometries. The optimum operation wavelength ranges for different fiber geometries are found and strategies to introduce additional interfacial layers are demonstrated to be effective in further reducing the optical losses.
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