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This book provides a comprehensive§overview of the theory and practical development of metamaterial-based perfect§absorbers (MMPAs). It begins with a brief history of MMPAs which§reviews the various theoretical and experimental milestones in their§development. The theoretical background and fundamental working principles of§MMPAs are then discussed, providing the necessary background on how MMPAs work§and are constructed. There then follows a§section describing how different MMPAs are designed and built according to the§operating frequency of the electromagnetic wave, and how their§behavior is changed. Methods of fabricating and characterizing MMPAs are then§presented.§§The book elaborates on the performance§and characteristics of MMPAs, including electromagnetically-induced§transparency (EIT). It also covers recent advances in MMPAs and their§applications, including multi-band, broadband, tunability, polarization§independence and incidence independence.§§Suitable for graduate students in§optical sciences and electronic engineering, it will also serve as a valuable§reference for active researchers in these fields.§§