[rajnathani]

Physics noob here. But wouldn't it be possible for light to travel through a tube smaller than its wavelength? Here is something I found via a Google search: https://www.quora.com/Can-a-given-color-of-light-pass-throug...

[EVa5I7bHFq9mnYK]

What will happen, such a thin tube will not be able to confine the electromagnetic wave within its boundary, so most of the wave's field will propagate outside of the tube and will quickly diffract on any bumps it encounters.