electromagnetism - Is gravitational lensing the only way to concentrate light without photons being absorbed and re-emitted?

In other methods of concentrating light, the photons are absorbed and then emitted in a direction so that the photons converge upon a point. If we use gravitational lensing to concentrate light, are the photons not being absorbed and re-emitted?

Edit: By the way, another interpretation of Feynman diagrams is that photons are bouncing off of the electrons of the atoms of the lenses, rather than being absorbed and re-emitted. In that case, the question becomes "in gravitational lensing, do photons interact with any discrete particle in order to be concentrated"?