Also, since gravity is also a wave, can we use waveguides to guide gravity waves?
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Gravity acts to bend electric and magnetic fields in the same way as space time. However electromagnetic force is so much stronger than gravity. A fridge magnet can lift a fork against the entire gravitational field of the earth. So given a black hole or neuron star, you wouldn’t be able to produce a magnetic strong enough to fight gravity.
With waveguides, they function on the fact that electromagnetic waves can reflect off objects significantly larger than its wavelengths. Gravity in nearly all situations does not act as a wave. And even when gravitational waves are formed by incredibly heavy, fast moving objects (blackholes at significant fractions of the speed of light), gravitational waves cannot be reflected using matter, as it will just move the matter.
This would be like trying to make a audio waveguide out of sound foam, it wouldn’t work
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