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Microscale structures on the surface of optical interfaces have been known for over a century as an effective method of reducing Fresnel reflections. The eyes of a moth are covered with a natural anti-reflective nanostructured film.
In this work, we optimize the shape and dimensions of moth-eye structures for maximum output coupling through the endfaces of 𝐴𝑠2𝑆3 (n=2.45) chalcogenide optical fibers.
Rigorous computational EM propagation methods, like FDTD and RCWA, can be used to accurately simulate the transmission/reflection from the moth-eye surface.