Layered cuprates are a class of materials that exhibit high-temperature superconductivity and have been extensively studied due to their complex electronic properties. One of the fundamental phenomena in these materials is the behavior of longitudinal plasma waves, which are collective oscillations of charge carriers that play a crucial role in the understanding of their electronic properties, especially in relation to superconductivity and charge density waves. Investigating these longitudinal plasma waves in layered cuprates has proven to be a challenging task due to the intricate nature of the materials and the difficulty of directly measuring these waves. One promising method for studying longitudinal plasma waves is through the optical absorption in tilted geometries, a technique that allows for the indirect measurement of these waves. This method has shown significant potential in providing valuable insights into the dynamic behavior of the charge carriers in cuprates and their interactions with the underlying lattice. Optical absorption spectroscopy is a wellestablished technique that has been used to probe the electronic properties of various materials, including cuprates.
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