Quantum plasmonics in nanocavities and its application
Surface plasmons(SPs)are electromagnetic excitations coupled with electron waves in solid,which lead to the large negative dielectric constant of noble metals in the visible light range.They provide the ability to trap light in the nanoscale interface between the metal and the dielectric interface.Notably,ultrathin dielectric gaps between metals can trap plasmonic optical modes with surprisingly low loss and with volumes below a few tens of nm3,making it the most effective and accessible method to achieve field confinement.Plasmonic nanostructures gained rapid research interests as routes to optical devices beyond the diffraction limit of light,yielding viable nanophotonic devices,including optical metamaterials,biochemical sensing,plasmon chemistry,and nanophotonic light sources.The rapid progress in these applications has been made feasible through the availability of an extensive array of experimental tools for nanoscale fabrication,as well as robust electromagnetic simulation methods for theoretical analysis.In the meanwhile,significant interest has been devoted to the quantum properties of gap plasmons and quantum plasmonic devices that operate at the quantum level.Gap plasmonics not only helps to reveal novel quantum behaviors,which enhances fundamental understanding of quantum science,but also provides a platform for designing and manufacturing various quantum optoelectronic devices,making it an important part of the field of quantum plasmonics.Quantum plasmonics is a rapidly growing field of research that involves the study of quantum properties of light and its interaction with matter at the nanoscale.In particular,the past decade has witnessed substantial advancements in both the fundamental and applied realms of quantum plasmonics.This review presents a comprehensive overview of recent advancement in the field of quantum plasmonics within nanocavities,spanning from scientific understanding to technological applications.The discussion commences with an exploration of the quantum phenomena in plasmonic nanocavity systems,accompanied by an introduction to the development of relevant theoretical frameworks and the progress achieved through experimental investigations.Subsequently,a summary of the research and application progress in nanocavity quantum plasmonics over the past decade is provided,encompassing topics such as tunneling luminescence,light-matter interactions,quantum light sources,and high-precision sensing at the quantum level.Finally,the review concludes by highlighting pertinent challenges that demand attention and proposing novel directions for future exploration in the field.
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