We test strategies for placing EIT electrodes on a 3D medium for the purpose of calculating 3D reconstructions using clinical equipment intended for use with a 2D adjacent drive protocol. The goal of this work was to compare seven such strategies in order to determine if any were clearly superior to the others for clinical applications. For the limited set of strategies investigated, none were ...

Absolute images have important applications in medical Electrical Impedance Tomography (EIT) imaging, but the computations are very sensitive to modeling errors and noise. In this paper the effects of errors in domain shape and electrode placement on absolute images computed with 2-D D-bar reconstruction algorithms are studied. It is demonstrated with experimental tank data from several EIT sys...

We consider the possibility of wave propagation in the normally disallowed ~band-gap! region of a resonant optical medium, that is, in the band of frequencies near resonance where the real part of the frequencydependent dielectric function is negative. We demonstrate that wave propagation can become allowed by the application of a strong electromagnetic field resonant with some additional trans...

Electromagnetically induced transparency has been observed in K2 two-photon transitions by fluorescence detection. The twophoton absorptions correspond to 2Pg XRg transitions through ARu bPu mixed intermediate enhancing levels, which are coincidentally on resonance with the excitation laser frequency. Laser intensity dependence of this effect has been studied and different detection schemes hav...

In this paper we examine the absorption and dispersion properties of a weak probe field via Electromagnetically Induced Transparency (EIT) in a four-level system. It is shown that under certain condition, using this model, the absorption cancellation is appeared and the medium becomes transparent to the weak probe field. It will be shown that the controlling of absorption and dispersion spectru...

We consider a four-level atomic system in inverted-Y configuration and study the phenomenon of electromagnetically induced transparency (EIT) in this system under various parametric conditions in order to demonstrate controllability of the EIT and its dispersion properties.  2003 Elsevier B.V. All rights reserved. PACS: 42.50.Hz; 32.80.Wr; 42.65.Ky

We show that the effective decay rate of Zeeman coherence, generated in a 87 Rb vapor by linearly polarized laser light, increases significantly with the atomic density. We explain this phenomenon as the result of radiation trapping. Our study shows that radiation trapping must be taken into account to fully understand many electromagnetically induced transparency experiments with optically thi...

The discovery of “EIT waves” after the launch of SOHO spacecraft sparked wide interest among the coronal mass ejection (CME) community since they may be crucial to the understanding of CMEs. However, the nature of this phenomenon is still being hotly debated between fast-mode wave explanation and non-wave explanation. Accumulating observations have shown various features of the “EIT waves”. For...

We report electromagnetically induced transparency for the D1 and D2 lines in 6 Li in both a vapour cell and an atomic beam. Electromagnetically induced transparency is created using co-propagating mutually coherent laser beams with a frequency difference equal to the hyperfine ground state splitting of 228.2 MHz. The effects of various optical polarization configurations and applied magnetic f...