Abstract
This chapter reviews the theoretical picture of the dressed photon by combining the concepts of quantum field theory, optical science, and condensed-matter physics. Based on the exchange of dressed photons, energy transfer to an electric dipole-forbidden energy level is described. Furthermore, the possibility of coupling a dressed photon with a coherent phonon is presented, revealing a novel phonon-assisted process in light–matter interactions in nanometric space. Applications to qualitatively innovative optical devices, fabrication techniques, energy conversion, and systems are exemplified.
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