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Researchers from ITMO, in collaboration with the Leibniz Institute of Photonic Technology and Australian National University, have resolved the fundamental problem of light coupling into optical fiber at incidence angles of over 70°.
The researchers used a dielectric nanostructure with a high refractive index, made from silicon nitride, implemented at the end face of the optical fiber, to overcome the fact that in conventional optical fibers at a incidence angle of 15°, efficiency drops to nearly zero. The drop significantly limits the functionality and potential of optical fiber-based applications.
The nanostructure allows light to propagate through the optical fiber at large incidence angles. Courtesy of ITMO.
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