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arXiv:1201.0581

Electromagnetically Induced Transparency Spectroscopy

Asaf Eliam, Shapiro, Evgeny A., Moshe Shapiro

Published Jan 3, 2012• 0 citations
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Abstract

We propose a method based on the Electromagnetically Induced Transparency (EIT) phenomenon for the detection of molecules which exist as a small minority in the presence of a majority of absorbers. The EIT effect we employ effectively eliminates the absorption of the majority species in the spectral region where it overlaps with the absorption of the minority species. The method can also be used to enhance local-modes transitions which overlap spectrally with a background of other local-modes transitions of the same molecule. The general theory is applied to the case of sparse and congested background spectra within the same molecule and to the recording of the spectra of isotopomers (of Chlorine and Methanol) that are in minority relative to other isotopomers which constitute the majority of molecules present.

DOI
10.48550/arxiv.1201.0581

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We propose a method based on the Electromagnetically Induced Transparency (EIT) phenomenon for the detection of molecules which exist as a small minority in the presence of a majority of absorbers. The EIT effect we employ effectively eliminates the absorption of the majority species in the spectral region where it overlaps with the absorption of the minority species. The method can also be used to enhance local-modes transitions which overlap spectrally with a background of other local-modes transitions of the same molecule. The general theory is applied to the case of sparse and congested background spectra within the same molecule and to the recording of the spectra of isotopomers (of Chlorine and Methanol) that are in minority relative to other isotopomers which constitute the majority of molecules present.
We propose a method based on the electromagnetically induced transparency (EIT) phenomenon for the detection of molecules which exist as a small minority in the presence of a majority of absorbers. The EIT effect we employ effectively eliminates the absorption of the majority species in the spectral region where it overlaps with the absorption of the minority species. The method can also be used to enhance local-modes transitions which overlap spectrally with a background of other local-modes transitions of the same molecule. The general theory is applied to the case of sparse and congested background spectra within the same molecule and to the recording of the spectra of isotopomers (of chlorine and methanol) that are in minority relative to other isotopomers which constitute the majority of molecules present.
Summary form only given. Electromagnetically induced transparency (EIT) is a process by which a normally absorbing material is made transparent by application of electromagnetic radiation. It has a number of applications, including lasing without inversion and slow light. We see that the EIT resonances corresponding to the hyperfine levels are either inhibited, or enhanced depending on the position of the hyperfine transitions in relation to the applied rf field. We discuss the role of level splitting (destruction of EIT) and three photon resonance peaks in the resulting spectra. A 2 cm rubidium cell, heated to approximated 60 C is probed with a 780 nm laser.
Metamaterial (MM) is artificial material in which an unit cell, having a size much smaller than the wavelength of external electromagnetic (EM) wave, is periodically arranged. This MM offers a new tool that can significantly improve the effectiveness of absorber and the sensitivity of sensor through its powerful localization and field enhancement. This review presents recent the potential applications of electromagnetically-induced transparency (EIT) and absorption (EIA) phenomena in MM-based absorber and MM-based sensors, and summarizes the sensitivity differences from the existing sensors. These phenomena provide a high-performance platform for a variety of sensors with easy adjustment of the EM response, and can produce effective narrow- or multi-band absorption.
This report shows that the electromagnetically-induced transparency (EIT) window can be used as a time-to-frequency filter for the probe pulse whose spectrum is much broader than the width of the EIT window. This study demonstrates that the narrow spectral region of the pulse, coincident with the EIT window, develops in a long Gaussian pulse with slow group velocity. An analytical theory is developed describing the propagation of a small amplitude pulse through an optically dense absorptive medium with a narrow EIT window.