Also, since gravity is also a wave, can we use waveguides to guide gravity waves?
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Electromagnetic waves are influenced by gravity. That influence is just very small for most examples, because electromagnetic waves are moving way *way* faster than Earth’s escape velocity.
Gravity *can form* waves. To create a waveguide for these waves would require us to efficiently interact with them. A waveguide works with (some) electromagnetic waves because the electrons in metal are free to move in a way that mimics the wave and even creates copies of it. This doesn’t take too many electrons. Gravity is relatively weak, and gravitational waves are very difficult to interact with at all.
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