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Interference between two electromagnetically induced transparencies

Neil B. Manson, C. Wei, J. P. D. Martin, Ed Wilson

Published May 12, 2000• 0 citations
OpenAlex

Abstract

Summary form only given. We study interference between electromagnetically induced transparency (EIT) features in the radio frequency region of the spectrum associated with an electron spin resonance in the nitrogen-vacancy center in diamond. Measurements are made using a coherent optical detection technique. Two EIT features can be induced in a single absorption band by two coupling fields at different frequencies. The frequencies of each features can be adjusted by varying the frequency of the coupling field and in the work the frequencies are adjusted so that the EIT features are in near coincidence.

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Electromagnetically induced transparency (EIT) resonance is obtained in a well-studied lambda three level system where an optical coupling field and a probing field interact with two optical transitions. However, both electromagnetically induced absorption (EIA) and EIT can be obtained in a modified quasi-lambda four level system consisting of an optical-radio two-photon coupling field and a probing field. By solving the density matrix equation of motion, a physical account of EIA and EIT is given in terms of a dressed state picture. It can be seen that the optical coupling field in this quasi-lambda four level system has a crucial effect on the forming of EIA and EIT. An EIA is observed under a resonant optical coupling and it evolves into an EIT when there is a detuning. Furthermore, the width of EIA or EIT increases as the optical coupling Rabi frequency increases.

Acta Physica Sinica•Jan 1, 2008•10 citations
Summary form only given. We study interference between electromagnetically induced transparency (EIT) features in the radio frequency region of the spectrum associated with an electron spin resonance in the nitrogen-vacancy center in diamond. Measurements are made using a coherent optical detection technique. Two EIT features can be induced in a single absorption band by two coupling fields at different frequencies. The frequencies of each features can be adjusted by varying the frequency of the coupling field and in the work the frequencies are adjusted so that the EIT features are in near coincidence.
We use electromagnetically induced transparency (EIT) to probe the narrow electron-spin resonance of nitrogen-vacancy centers in diamond. Working with a multipass diamond chip at temperatures 6--30 K, the zero-phonon absorption line (637 nm) exhibits an optical depth of 6 and inhomogeneous linewidth of $\ensuremath{\sim}30\text{ }\text{ }\mathrm{GHz}$ FWHM. Simultaneous optical excitation at two frequencies separated by the ground-state zero-field splitting (2.88 GHz) reveals EIT resonances with a contrast exceeding 6% and FWHM down to 0.4 MHz. The resonances provide an all-optical probe of external electric and magnetic fields with a projected photon-shot-noise-limited sensitivity of 0.2  V/cm/Hz0.2\text{ }\text{ }\mathrm{V}/\mathrm{cm}/\sqrt{\mathrm{Hz}}0.2  V/cm/Hz​ and 0.1  nT/Hz0.1\text{ }\text{ }\mathrm{nT}/\sqrt{\mathrm{Hz}}0.1  nT/Hz​, respectively. Operation of a prototype diamond-EIT magnetometer measures a noise floor of $\ensuremath{\lesssim}1\text{ }\text{ }\mathrm{nT}/\sqrt{\mathrm{Hz}}$ for frequencies above 10 Hz and Allan deviation of $1.3\ifmmode\pm\else\textpm\fi{}1.1\text{ }\text{ }\mathrm{nT}$ for 100 s intervals. The results demonstrate the potential of diamond-EIT devices for applications ranging from quantum-optical memory to precision measurement and tests of fundamental physics.
Using electron-spin-resonance transitions within the nitrogen-vacancy center in diamond, we have obtained a sharp electromagnetically induced transparency (EIT) feature when the coupling and probing fields satisfy a two-photon resonance condition. In this paper it is shown that by the application of an additional driving field the sharp EIT feature can be split into a doublet or a triplet depending on the experimental configuration. The results are interpreted in terms of dynamic Stark splitting of the EIT feature, and the spectra are shown to be related to Autler-Townes and Mollow spectra.
In this paper, we theoretically investigate the optical absorption spectrum of the nanodiamond system consisting of the nitrogen- vacancy (NV) spin coupled to the mechanical resonator. We show how the widths of electromagnetically induced transparency (EIT) phenomenon windows are manipulated by varying the system parameters. The better transparency phenomenon effect can be achieved by appropriately reducing the decay rates of the mechanical resonator. It is shown that the probe absorption spectrum exhibits an asymmetric property. In particular, the coupling strength between the NV spin and the mechanical oscillation of the nanodiamond can be detected, which is realized by measuring the width of two peaks in the pump-probe spectrum. The study may provide a potential application in the fields of high precision measurement and quantum information processing.
This final technical report summarizes research supported by ARO in two areas: electromagnetically induced transparency (EIT) from electron spin coherence and cavity QED with nitrogen vacancy (NV) centers in diamond nanocrystals. We have developed three different schemes to realize EIT using electron spin coherence in semiconductor quantum wells. The three schemes include the use of V-type three-level systems via heavy hole excitonic transitions in an external magnetic field in the Voigt geometry, the use of V-type three-level systems via light hole excitonic transitions in a waveguide geometry and in the absence of an external magnetic field, and the use of a lamda-type three-level system in a mixed-type quantum well structure. We have achieved the breakthrough of realizing the strong coupling regime in cavity QED by coupling NV centers in diamond nanocrystals to whispering gallery modes in a deformed fused silica microsphere. In addition, our improved understanding on how electron spin coherence contributes to nonlinear optical processes in semiconductors has also led to the demonstration of a spin manipulation scheme that controls both the amplitude and phase of electron spin precessions.
Electromagnetically induced transparency (EIT) resonance is obtained in a well-studied lambda three level system where an optical coupling field and a probing field interact with two optical transitions. However, both electromagnetically induced absorption (EIA) and EIT can be obtained in a modified quasi-lambda four level system consisting of an optical-radio two-photon coupling field and a probing field. By solving the density matrix equation of motion, a physical account of EIA and EIT is given in terms of a dressed state picture. It can be seen that the optical coupling field in this quasi-lambda four level system has a crucial effect on the forming of EIA and EIT. An EIA is observed under a resonant optical coupling and it evolves into an EIT when there is a detuning. Furthermore, the width of EIA or EIT increases as the optical coupling Rabi frequency increases.