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The advent of photonic bandgap (PBG) guiding hollow- core photonic crystalfiber (HC-PCF) sparked the hope of guiding light with attenuation below thefundamental silica Rayleigh scattering limit (SRSL) of conventional step-indexfibers. Unfortunately, the combination of the strong core-claddingoptical-overlap, the surface roughness at the silica cladding struts and thepresence of interface-modes limited the lowest reported transmission-loss to1.2 dB/km at 1550 nm. This hope is recently revived by the introduction ofhypocycloid core- contour (i.e. negative curvature) in inhibited-coupling (IC)guiding HC-PCF, and the reduction of their confinement loss to a level thatmakes them serious contenders for light transmission below the SRSL in UV-VIS-NIR spectral range. Here, we report on several IC guiding HC-PCFs with ahypocycloid core-contour and a cladding structure made of a single ring from atubular lattice. The fibers guide in the UV-VIS and NIR, and among which welist one with a record transmission loss of 7.7 dB/km at ~750 nm (only a factor~2 above the SRSL), and a second with an ultra-broad fundamental-band with lossin the range of 10-20 dB/km spanning from 600 to 1200 nm. Both fibers presentnear-single mode guidance and very low bend loss sensitivity. The results showthat the limit in the transmission is set by confinement loss for wavelengthslonger than ~1 {\mu}m and by surface- roughness for shorter wavelengths, thusindicating that transmission loss well below the SRSL in the visible ispossible with a surface roughness reduction and would open the possibility ofthe first UV low-loss light- guidance.

Ultra-low transmission loss (7.7 dB/km at 750 nm) inhibited-coupling  guiding hollow-core photonic crystal fibers with a single ring of tubular  lattice cladding