Hollow core fiber? Total internal reflection requires the core to be a higher index of refraction than the cladding, so I wonder how that works! Turns out, it

Hollow core fiber? Total internal reflection requires the core to be a higher index of refraction than the cladding, so I wonder how that works! Turns out, it functions differently. Instead of total internal refraction it has to rely on weird physics like photonic crystals. The pictures are absolutely wild. https://www.rp-photonics.com/hollow_core_fibers.html https://www.rp-photonics.com/hollow_core_fibers.html https://www.google.com/search?q=hollow+core+fiber&tbm=isch https://www.google.com/search?q=hollow+core+fiber&tbm=isch