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Stratified Media for Novel Optics, Perfect Transmission and Perfect Coherent Absorption
Published in Shyamal Bhadra, Ajoy Ghatak, Guided Wave Optics and Photonic Devices, 2017
Passive MMs, though lossy, can have interesting applications albeit in a different frequency domain, where μ > 0 but ε < 0. The transmission through a slab of such MMs exhibits a bandgap much like in one-dimensional periodic structures [49]. A dielectric cavity with mirrors formed by such MMs can exhibit critical coupling (CC), whereby all the incident energy is absorbed by the walls of the cavity. Such a cavity does not allow the radiation to pass through, yet it maintains exceedingly low reflection. In other words, such a cavity acts like a near-perfect absorber at one or more frequencies. The interaction of such a cavity with resonant atoms can lead to mode splitting, like vacuum Rabi splitting, in cavity quantum electrodynamics (QED).
Future Perspectives
Published in Costantino De Angelis, Giuseppe Leo, Dragomir N. Neshev, Nonlinear Meta-Optics, 2020
Giuseppe Marino, Carlo Gigli, Aloyse Degiron
At variance with the weak coupling interactions that are usually leveraged in nonlinear metasurfaces, exotic nonlinearities could be also achieved in the regime of (ultra-) strong coupling. At the heart of cavity quantum electrodynamics [30], strong coupling denotes a situation for which a material system (e.g., a quantum dot, a molecule or a quantum well) is coupled to an optical cavity with so little losses that energy is periodically exchanged between the two. The resulting eigenmodes of the structure are hybrid light-matter states, with energies distinct from those of the uncoupled system. The difference between the energies, known as Rabi splitting, is all the more pronounced that the interactions are strong. In the limit of ultra-strong coupling, the coupled-modes can have radically new properties, such as lifetimes that have no relationship with those of the modes of the uncoupled system. Recently, there has been a considerable interest in these so-called non-Markovian states [31], as it has been demonstrated by Ebbesen et al. and other groups that these states can be used for many purposes, ranging from enhancing the conductivity of molecular layers [32,33] to dramatically changing the kinetics of chemical reactions [34]. In other words, ultra-strong coupling opens a new realm in nanochemistry and material science, as it makes it possible to create states with no equivalent that can be manipulated and leveraged at will. Spectacularly, most of these demonstrations have been made in the dark, in the absence of real photons. These results prove that the phenomena behind the observations truly belong to the realm of cavity quantum electrodynamics, since experiments in the dark can only be interpreted by the fact that it is the quantum fluctuations of the vacuum that ensure the formation of the coupled states.
Multistability and Fano resonances in a hybrid optomechanical photonic crystal microcavity
Published in Journal of Modern Optics, 2021
Sajia Yeasmin, Surabhi Yadav, Aranya B. Bhattacherjee, Souri Banerjee
Cavity quantum electrodynamics (C-QED) explores the physics of enhanced interaction between photons and quantum emitters confined in a small volume [1,2]. Coherently controlling the spontaneous emission of the quantum emission of the quantum emitter has been one of the key advantages of C-QED [3,4] and is now called the Purcell effect [5]. In the strong coupling regime, the reversible interaction between quantum emitters and photons lead to a remarkable quantum phenomenon called the vacuum Rabi splitting (VRS) [6], which has been observed experimentally in different C-QED systems [7–11]. The cavity mode decay rate, non-resonant decay rate and emitter-photon coupling strength are the parameters which define three different characteristic time-scale for the dynamics of the emitter-photon system to be classified as either weak or strong coupling [12–16]. In a recent theoretical study, auxiliary-cavity-assisted VRS in a hybrid photonic crystal (PhC) nano-cavity embedded with a quantum dot (QD), has been demonstrated. The results indicated that the auxiliary cavity played a crucial role to control the dynamics of the system [17].