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Conference on Lasers and Electro-Optics

Distinction of EIT and ATS using photonic crystal nanobeam cavities-waveguide coupled system

Tongyu Nie, Yong‐Pan Gao, Ying Hua Yang, Chao Wang, Daquan Yang, Huiping Tian

Published Jan 1, 2022• 0 citations
Publisher

Abstract

Here we demonstrate the electromagnetically induced transparency and Autler–Townes splitting in a photonic-crystal-nanobeam-cavity-waveguide coupled system for the first time. This work enables to evaluate the interference of fields in integrated optical system.
DOI
10.1364/cleo_at.2022.jtu3b.32

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Communications in Theoretical Physics•Feb 1, 2017•3 citations
In this paper, we quantitatively distinguish electromagnetically induced transparency (EIT) and Autler–Townes splitting (ATS) in a photonic crystal nanobeam cavity (PCNC)-waveguide coupled system. Akaike’s information criterion (AIC) is applied to calculate the two effects’ respective weights in the simulated transmission spectra. EIT and ATS are two phenomena that both have a transparent window in the transmission caused by different mechanisms in the atomic system. It’s difficult to distinguish these two phenomena directly from the spectrum. AIC provides a measurement distinguishing the two effects in the atomic, plasmonic, optomechanical system, etc. Based on the temporal coupled-mode theory, the theoretical model of the structure is established, and the transmission formula is deduced. Distance between the PCNC and the waveguide is varied to further explore the factors affecting the weights. The study shows great potential in precisely and quantitatively evaluating the interference of fields in future optical on-chip integration design.
Electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS) are two phenomena that can affect the transmission of a probe field in the presence of a stronger field, both yielding transparency in the absorption profile. Being able to discriminate these two similar but distinct phenomena is of vital importance. Here we propose a scheme to describe the EIT and ATS phenomena in a plasmonic system. The proposed system consists of one radiative resonator and one subradiant resonator in metal-insulator-metal waveguide, and the transition is observed from the ATS model to the EIT model through three qualitative regions as the coupling strength decreases. In addition, we apply the method proposed by Anisimov to the induced transparency spectrum in our model, and numerically discerning EIT from ATS based on the Akaike's information criterion in a clear way.
All-optical analogues of electromagnetically induced transparency (EIT) and Autler–Townes splitting (ATS) have been investigated on various platforms due to its wide applications in optical devices. This theoretical study suggests an immune scheme to fabrication disorders based on the topological waveguide that couples with two cavities. On the one hand, the topological waveguide is immune to local disorders and can tolerate moderate global ones due to bulk gaps of photonic crystals. On the other hand, the global disorders are utilized to induce a frequency splitting between the two cavities, which is responsible for transparent peaks in transmission spectra. Moreover, the maximum tolerated disorders are theoretically analyzed, indicating that fabrication disorders in such a scheme can be used to design EIT or ATS.
Abstract Discerning electromagnetically induced transparency (EIT) from Autler–Townes splitting (ATS) is a significant issue in quantum optics and has attracted wide attention in various three-level configurations. Here we present a detailed study of EIT and ATS in a five-level atomic system considered to be composed of a four-level Y-type subsystem and a three-level Λ-type subsystem. In our theoretical calculations with standard density matrix formalism and steady-state approximation, we obtain the general analytical expression of the first-order matrix element responsible for the probe-field absorption. In light of the well-known three-level EIT and ATS criteria, we numerically show an intersection of EIT with ATS for the Y-type subsystem. Furthermore, we show that an EIT dip is sandwiched between two ATS dips (i.e., multi-dip mixture of EIT and ATS) in the absorption line for the five-level system, which can be explained by the dressed-state theory and Fano interference.