This textbook provides introductions of how the traditional experimental technique - Spectroscopic Ellipsometry can also be used to characterize intrinsic properties of novel materials. The classes of materials that this book focuses on include the scientifically and technologically important such as two-dimensional transition metal dichalcogenides (2D-TMDs), magnetic oxides such as manganite materials, and unconventional superconductors in the form of copper oxide (cuprate) systems. The characterization of properties including electronic structures, interfacial properties and arising quasiparticle dynamics in such novel quantum materials are discussed in detail.