Weaponized Gold

I had this idea decades ago.

I let AI do the numbers.

A disk of Gold Foil 100nm thick, 8000 km in diameter, would weigh about 100 million metric tons. That's a LOT of gold.

But if such a disk were hung at L1, with steering jets to manage photonic forces, it would block all light from reaching Earth.

Those photonic forces approach 500 Thousand Newtons, so the attacking species must have fully spacefaring technology.

Atom bombs from Earth could blow large holes in the disk, but not big enough to grow crops through.

Has anyone written a book using this attack method to wipe out humanity?

It would be easy to see holdouts by their thermal signature.