[Lonesome in Massachussets]

This is a superior method of focusing sunlight than an array of mirrors because?

[steve86]

"This is a superior method of focusing sunlight than an array of mirrors because?"

Such a device could be used to harvest solar energy in places where the light is too diffuse for mirrors to concentrate it onto a solar cell. An optical black hole would suck it all in and direct it at a solar cell sitting at the core. "If that works, you will no longer require these huge parabolic mirrors to collect light," says Narimanov.

Sucks it in from all over Kingdom-come. Instant black-out for the universe.

[Blood of Tyrants]

Mirrors merely reflect light. This device actually captures it.

[ConservativeMind]

Nothing is reflected or poorly absorbed. All the light is trapped for 100% use.