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arXiv:2210.00547 · The European Physical Journal Plus

Multiple electromagnetically induced transparency without a control field in an atomic array coupled to a waveguide

W. Z. Jia, Quangan Cai

Published Sep 26, 2022• 5 citations
arXivHTMLPDF
DOI
10.1140/epjp/s13360-022-03284-4

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We have studied the electromagnetically induced transparency for a two level ensemble interacting with two orthogonal optical modes. We have made a approach for a multimode silicon waveguide coupled to a plasmonic resonator array. We have shown that a simple periodic ensemble of resonant metal nanoparticles within a dielectric waveguide supported a transparent waveguide plasmon polariton mode for guided slow light propagation. Such systems inhert the strongly dispersive properties of the nanoparticles embedded in the waveguide but do not succumb to the associated absorptive losses by utilizing the system’s transparency Light propagation through the system provided extremely strong dispersion from the resonators, but suffers very low propagation loss by exploiting the system’s transparency. Dispersion is controllable by tuning the coupling strength of localized plasmon and waveguide modes. We have found that atomic electromagnetically induced transparency occurred for a non zero pump field allowing mutual coupling of all states and induced destructive quantum interference of the probe field’s absorption via the transition. The obtained results were found in good agreement with previously obtained results.
The absorption of photons in a three-level atom can be controlled and manipulated by applying a coherent drive at one of the atomic transitions. The situation where the absorption is fully canceled, and the atom thus has been turned completely transparent, has been coined electromagnetically induced transparency (EIT). The characteristics of EIT is a narrow transparency window associated with a fluorescence quench at its center frequency, indicating that inelastic scattering at this particular point is suppressed. The emergence of EIT-like transparency windows is common in waveguide quantum electrodynamics (QED) when multiple closely spaced quantum emitters are coupled to a waveguide. The transparency depends on the separation and energy detuning of the atoms. In this work, we study a number of different setups with two-level atoms in waveguide QED that all exhibit EIT-like transparency windows. Unlike the case of a genuine three-level atom, no drive fields are required in the systems we consider, and the coherent coupling of energy levels is mediated by the waveguide. We specifically distinguish between systems with genuine EIT-like dynamics and those that exhibit a transparency window but lack the fluorescence quench. The systems that we consider consist of both small and giant atoms, which can be experimentally realized with artificial atoms coupled to either photons or phonons. These systems can offer a simpler route to many EIT applications since the need for external driving is eliminated.