EIT-related phenomena and their mechanical analogs

Abstract

Systems of interacting classical harmonic oscillators have received considerable attention in the last years as analog models for describing electromagnetically induced transparency (EIT) and associated phenomena. We review these models and investigate their validity for a variety of physical systems using two- and three-coupled harmonic oscillators. From the simplest EIT-$\Lambda$ configuration and two-coupled single cavity modes we show that each atomic dipole-allowed transition and a single cavity mode can be represented by a damped harmonic oscillator. Thus, we have established a one-to-one correspondence between the classical and quantum dynamical variables. We show the limiting conditions and the equivalent for the EIT dark state in the mechanical system. This correspondence is extended to other systems that present EIT-related phenomena. Examples of such systems are two- and three-level (cavity EIT) atoms interacting with a single mode of an optical cavity, and four-level atoms in a inverted-Y and tripod configurations. The established equivalence between the mechanical and the cavity EIT systems, presented here for the first time, has been corroborated by experimental data. The analysis of the probe response of all these systems also brings to light a physical interpretation for the expectation value of the photon annihilation operator $⟨a⟩$. We show it can be directly related to the electric susceptibility of systems, the composition of which includes a driven cavity field mode.

20 pages and 15 figures

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• Description of ultrastrong light-matter interaction through coupled harmonic oscillator models and their connection with cavity-QED Hamiltonians
• Frequency shifts of radiating particle moving in EIT metamaterial
• Resonance order-dependent plasmon-induced transparency in orthogonally-arranged nanoscale cavities
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• Controlled processing of signal stored in metamaterial with tripod structure
• Analogue of double-$\Lambda$-type atomic medium and vector dromions in a plasmonic metamaterial
• Optomechanical non-reciprocity and its equivalence to antiresonance: Control of isolation frequency using mechanical drive