The study of gravitational waves has revolutionized our understanding of the universe, marking a significant milestone in astrophysics. Einstein first predicted the existence of these waves in 1916, stemming from his groundbreaking theory of General Relativity, but it wasn’t until 2015 that scientists achieved their first direct detection. As the sensitivity of gravitational-wave detectors continues to improve, it opens up exciting new avenues for exploration, one of which is the gravitational lensing of gravitational waves. According to Einstein's theory, much like light, gravitational waves can be affected by the gravitational fields of intervening matter. Recent studies suggest that we may soon observe gravitational-wave lensing as existing ground-based detectors undergo upgrades in the coming years. Notably, the techniques used to detect and utilize gravitational-wave lensing differ significantly from those employed in light lensing; while light involves detecting particles, gravitational waves are detected as waves, specifically from merging black holes. This distinction presents both challenges and opportunities for new applications in the field.
