Can Optogenetics Be Used Non-Invasively.

Is there a way to use Optogenetics non invasively like the Gamma Knife.
Using Optogenetics they have to remove
part of the skull on a mouse,or monkey, in order to place the optical cables to control neurons using blue, and orange light.
But can this be
done non-invasively like how the Gamma Knife is used to treat people with brain tumors.
Gamma
Knife beams of radiation penetrate through the skull, and target the tumor without using surgery.
So can only gamma rays, or other type
rays
like inferred rays, radio waves, ultra violet penetrate through the skull, and
the
brain, can it be done with rays of light, So can Optogenetics be used non-invasively.