Electromagnetically induced transparency

About: Electromagnetically induced transparency is a research topic. Over the lifetime, 5201 publications have been published within this topic receiving 142180 citations. The topic is also known as: EIT.

Nanomechanical-resonator-assisted induced transparency in a Cooper-pair-box system

Abstract: We propose a scheme to demonstrate the electromagnetically induced transparency (EIT) in a system of a superconducting Cooper-pair box coupled to a nanomechanical resonator. In this scheme, the nanomechanical resonator plays an important role to contribute additional auxiliary energy levels to the Cooper-pair box so that the EIT phenomenon could be realized in such a system. We call it here resonator-assisted induced transparency (RAIT). This RAIT technique provides a detection scheme in a real experiment to measure physical properties, such as the vibration frequency and the decay rate, of the coupled nanomechanical resonator.

Investigation of electromagnetically induced transparency in the strong probe regimen

Abstract: Summary form only given. Though experiments in which a strong probe field was applied to an EIT system have been performed using pulsed lasers, previous investigations of the steady-state response of an EIT system to cw lasers have focused on the limit in which the probe field is weak. We investigate the behavior of an inhomogeneously broadened ladder system interacting with probe and control fields that are both strong. The experimental system we study is a gas of /sup 85/Rb atoms, where the lower level is the 5S/sub 1/2/ state, the intermediate level is the 5P/sub 3/2/ state, and the upper level is the 5D/sub 5/2/ state. To facilitate two-photon Doppler cancellation, the control and probe laser beams are counterpropagating. We theoretically model the response of this system by numerically solving the appropriate system of density-matrix equations without any approximations with respect to the strength of the control or probe field, and then numerically performing a Doppler average over the atomic velocity distribution.

Modeling of Electromagnetically Induced Transparency With RLC Circuits and Metamaterial Cell

Abstract: The amplitude and phase characteristics of metamaterial cells consisting of microstrip and dielectric resonators (DRs) were studied. Circuits containing resonators of fundamentally different quality factors in the microwave range and excited on different types of oscillations have two independent energy ways, which allows the simulation of Fano resonances and electromagnetically induced transparency (EIT). The effects associated with the anomalous dispersion of the metamaterial cell as well as the associated positive values of the group delay (GD) are demonstrated. The experimental and calculated characteristics of metamaterial cells were compared. As the model of metamaterial cell calculation, the lattice circuit of an all-passing filter based on lumped elements was used. It was shown that the numerical calculations of systems exhibiting resonant phenomena (including the Fano effect) can be simplified based on the four-pole network containing the following parameters: unloaded, external, and loaded quality factors of resonators and detuning between their resonant frequencies. The calculated and measured characteristics were found to be in good agreement, which indicates the adequacy of the proposed models.

Optical Stern–Gerlach effect via a single traveling-wave light

Abstract: In this paper, we propose a simplified model of the optical Stern–Gerlach effect based on coherent coupling between the clock transition of alkaline-earth single atoms and a traveling-wave light. It is demonstrated that spin–orbit coupling-induced chiral motion in atom deflection appears under strong atom–light interaction. The strong optical driving removes the perturbation from the Doppler effect and back-action effect to access the coherent system. In this process, the superposition of distant matter waves connected to the arbitrary distribution of the atom internal state could be predicted, which is important for the realization of atom interferometry and quantum-state operation. The influence of atom relaxation and atom–atom interactions is discussed. The basic conditions for the experimental design are given at the end of this work.

Constant frequency reconfigurable terahertz metasurface based on tunable electromagnetically induced transparency-like approach

Abstract: A terahertz constant frequency reconfigurable metasurface based on tunable electromagnetically induced transparency (EIT)-like property was designed, whose transparency window frequency did not vary with Fermi energy. This structure was composed of two single-layer graphene resonators, namely, left double big rings and right double small rings. An evident transparency window (EIT-like phenomenon) was caused by the near-field coupling between bright modes of the two resonators in the transmission spectrum, in which amplitude over 80% was acquired at 1.98 THz. By individually reconfiguring the Fermi energy of each resonator, the EIT-like effects, transparency window amplitude, modulation speed and group delay could be actively controlled while the frequency of EIT-like window remained constant. Significantly, the transparency window was fully modulated without changing the frequency, and the maximum modulation depth reached 78%. Furthermore, the modulation speed also increased because the total graphene area A was effectively reduced in the proposed structure. Compared with other metasurface structures, the modulation properties of the proposed structure showed higher performance while the EIT-like window frequency remained static. This research provides an alternative method for developing constant frequency reconfigurable modulation terahertz devices (such as optical switches and modulators), as well as a potential approach for miniaturization of terahertz devices.