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In ancient Rome, architects mastered the skills of using vases and walls to control sounds in a theater.In physics, such a principle applies not only to acoustics but also to electromagnetics.Based on the deep understanding of radiation processes, a notion has long been accepted, that is, an emitter interacts with the photonic eigenstates of its surrounding environment, thus laying a pivotal foundation for quantum mechanics development.This notion has also led to the concept of zero-point energy and Purcell effect, where the light-matter interaction can be controlled and manipulated by constructing a desired photonic state.Along with the development of dielectric structures, photonic crystals, plasmonics and metamaterials during the past decades, great progress has been achieved in construction of desired photonic states and control of the light-matter interaction.This triggers various novel applications, including low-threshold lasers, efficient single-photon sources, and quantum information processing.The 2012 Nobel Prize in Physics was awarded for particle control based on the control of the light-matter interaction at the quantum level.