Delay-bandwidth product of electromagnetically induced transparency media

Tidström, Jonas; Jänes, Peter; Andersson, L. Mauritz

doi:10.1103/physreva.75.053803

Cited by 22 publications

(20 citation statements)

References 41 publications

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“…On the other hand, this narrow linewidth directly limits the bandwidth of data that can be processed. A signal which has a broader bandwidth than the EIT linewidth will be filtered such that only part of the pulse having the EIT linewidth will be transmitted and delayed [7,8]. In terms of sensing this means that although a very high sensitivity is possible using EIT, it is a problem to probe with this sensitivity a broadband field in a simple way.…”

Section: Introductionmentioning

confidence: 99%

Transient coherence of media under strong phase modulation exploiting electromagnetically induced transparency

Shwa

Katz

2014

Phys. Rev. A

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When quantum systems are shifted faster than their transition and coupling time scales, their susceptibility is dramatically modified. We measure the optical susceptibility of a strongly modulated electromagnetically induced transparency system. Time vs detuning plots for different pump modulation frequencies reveal a transition between an adiabatic regime where a series of smooth pulses are created and a nonadiabatic regime where a strong transient oscillating response is added. Applying a magnetic field lifts the hyperfine level degeneracy, revealing an interference effect between the different magnetic level transients. We explore the dynamics of the magnetic and nonmagnetic cases and discuss their coherent nature. We finally combine the global phase of the transmitted pulses with the transient interference to achieve broadband magnetic sensing without losing the sensitivity of a single electromagnetically induced transparency line.

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Section: Introductionmentioning

confidence: 99%

Transient coherence of media under strong phase modulation exploiting electromagnetically induced transparency

Shwa

Katz

2014

Phys. Rev. A

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“…However, group velocity dispersion and waveguide losses, that are not included in the model, set an upper limit on the device length. 47,48 As opposed to the Ξ-and Λ-scheme the delay obtained using the V-scheme is seen to approach an upper limit. Thus, the achieved delay is almost constant for intensities above 500 W/cm 2 only changing by less than 6 %.…”

Section: Propagation Effectsmentioning

confidence: 89%

“…As such, the calculated delay serves as an upper limit, since group velocity dispersion as well as absorption dispersion may restrict the device length. 47,48 V. CONCLUSION Slowdown effects in an inhomogeneously broadened quantum dot medium were analyzed for an ensemble of three level QDs strongly driven by a coupling field and probed by a weak field.…”

Section: Propagation Effectsmentioning

confidence: 99%

A scheme comparison of Autler–Townes based slow light in inhomogeneously broadened quantum dot media

Lunnemann

Mørk

2010

J. Opt. Soc. Am. B

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We propose a method to achieve significant optical signal delays exploiting the effect of AutlerTownes splitting in an inhomogeneously broadened quantum dot medium. The absorption and slow-down effects are compared for three schemes i.e. Ξ, V and Λ, corresponding to different excitation configurations. Qualitative differences of the V-scheme compared to the Ξ-and Λ-scheme are found, which show that features of Autler-Townes splitting are only revealed in the V-scheme. The underlying physical mechanisms causing this discrepancy are analyzed and discussed. Finally we compare field propagation calculations of the schemes showing significantly larger achievable signal delays for the V-scheme despite finite absorption of the coupling field. This opens the possibility for using waveguide structures for both coupling and probe fields, thus significantly increasing the achievable signal delays.

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“…One can see that the group index achieves its maximum value when the saturation parameter S = 0.5. We next introduce the delay-bandwidth product (DBP) [34] as it is a good figure of merit for slow-light experiments. The time delay, τ g , due to the medium is given by Eq.…”

Section: Absorption and Dispersion In Coherently Driven Two-level Sysmentioning

confidence: 99%

Non‐electromagnetically induced transparency mechanisms for slow light

Agarwal¹,

Dey²

2009

Laser & Photonics Reviews

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We show how the pump-induced sharp holes in homogeneously or inhomogeneously broadened absorption line shapes can be used for the production of ultra-slow light. We present a detailed discussion of underlying concepts and results on the pump power dependences of the group index and the bandwidth-delay product. Further, we discuss experimental results, which are in agreement with theoretical predictions.The variation of group index as function of the intensity of the pump field (S) at different probe detuning δ for an inhomogeneously broadened rare-earth doped crystal. 0

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Delay-bandwidth product of electromagnetically induced transparency media

Cited by 22 publications

References 41 publications

Transient coherence of media under strong phase modulation exploiting electromagnetically induced transparency

Transient coherence of media under strong phase modulation exploiting electromagnetically induced transparency

A scheme comparison of Autler–Townes based slow light in inhomogeneously broadened quantum dot media

Non‐electromagnetically induced transparency mechanisms for slow light

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