10^3 range of wavelengths sounds pretty damn scalable to me.
Metamaterials for visible light wavelengths do exist. One that got note in the press a few years ago has a negative index of refraction.
Panchromaticity could be accomplished via a color array scheme similar to what is already common in lithographic optic devices.
This not being your area is precisely why you should extend the researches some respect, rather than immediately pouncing on any plausible rhetorical trick to make yourself seem expert when you are not.
Sorry, upon rereading this it's more grumpy than I like; but in the interests of transparency I won't edit it. Just frustrated at a general trend on hacker news of assuming straw men when it's clear they don't exist from slightly more deliberate reading of the primary source.
Metamaterials for visible light wavelengths do exist. One that got note in the press a few years ago has a negative index of refraction.
Panchromaticity could be accomplished via a color array scheme similar to what is already common in lithographic optic devices.
This not being your area is precisely why you should extend the researches some respect, rather than immediately pouncing on any plausible rhetorical trick to make yourself seem expert when you are not.