Direct Observation of a Pulse Peak Using a Peak-Removed Gaussian Optical Pulse in a Superluminal Medium

Tomita, Makoto; Amano, Heisuke; Masegi, Seiji; Talukder, Aminul I.

doi:10.1103/physrevlett.112.093903

Cited by 20 publications

(9 citation statements)

References 26 publications

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“…This implies that all the input information that interacted with the medium before the termination point has already evolved at the output before the singularity reached the receiver. This behavior is generic and is in full agreement with [16,22,[24][25][26].…”

Section: Propagation Of Information In a Causal Superluminal Mediumsupporting

confidence: 79%

“…This suggests that for a superluminal pulse, the detection of meaningful information beyond the arrival of the strictly luminal pulse singularity (nonanalytic point) at the output is fundamentally prohibited [21]. A similar behavior has been demonstrated at optical frequencies in a ring resonator structure supporting superluminal propagation [22,23].…”

Section: Introductionmentioning

confidence: 85%

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Nonanalytic pulse discontinuities as carriers of information

Dorrah

Mojahedi

2016

Phys. Rev. A

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In this paper, we consider optical pulses encoded with two nonanalytic points, and we evaluate the detectable information of these pulses in media supporting slow-and fast-light propagation. It is shown that, in some configurations of slow-(subluminal) light propagation, the signal is not readily detectable, albeit the arrival of the encoded nonanalytic points at the receiver. It is thus argued that, from a practical point of view, information should not be entirely associated with the pulse discontinuities. On the other hand, it is confirmed that for propagation in vacuum or a fast-light medium, detectable information is bounded by the nonanalytic points, which create a space-time window within which detectable information cannot escape. As such, the distinction between the nonanalytic points of a signal, its energy transport, and detectable information is demonstrated.

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Section: Propagation Of Information In a Causal Superluminal Mediumsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 85%

Nonanalytic pulse discontinuities as carriers of information

Dorrah

Mojahedi

2016

Phys. Rev. A

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“…It appears in particular that the maximum of the output pulse is not as a direct reflection of that of the input pulse but results from the action of the system on the early part of the latter. A direct experimental evidence of this point is reported in [3]. Fast light can be obtained when the system transmission displays a well-marked, narrow dip at the carrier frequency of the input pulse [4].…”

Section: Introductionmentioning

confidence: 92%

On-resonance material fast light

Macke

Ségard

2018

Phys. Rev. A

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We theoretically revisit the problem of the propagation of coherent light pulses through a linear medium when the carrier frequency of the pulses coincides with the minimum of a narrow dip in the medium transmission. Considering realistic contrasts between the maximum and minimum transmission of the medium and incident pulses of strictly finite duration, we combine temporal and spectral approaches to obtain analytical expressions of the transmitted pulse that reproduce the main features of the exact numerical solutions derived by fast Fourier transform. A special attention is paid to the advance of the pulse maximum over that of a pulse covering the same distance in vacuum and the ratio of this advance to the pulse duration (fractional advance) is optimized.

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“…Superluminal group delay and negative group delay refer to the same phenomenon, but from different frames of reference, and are collectively referred-to as abnormal group delay (AGD). The fundamental rules governing AGD are now well established and can be attributed to spectral reshaping [1][2][3][4][5][6][7][8][9][10][11][12] and energy exchange between the medium and the propagating pulse [13,14].…”

Section: Introductionmentioning

confidence: 99%

Time-frequency dynamics of superluminal pulse transition to the subluminal regime

2015

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Spectral reshaping and nonuniform phase delay associated with an electromagnetic pulse propagating in a temporally dispersive medium may lead to interesting observations in which the group velocity becomes superluminal or even negative. In such cases, the finite bandwidth of the superluminal region implies the inevitable existence of a cutoff distance beyond which a superluminal pulse becomes subluminal. In this paper, we derive a closed-form analytic expression to estimate this cutoff distance in abnormal dispersive media with gain. Moreover, the method of steepest descent is used to track the time-frequency dynamics associated with the evolution of the center of mass of a superluminal pulse to the subluminal regime. This evolution takes place at longer propagation depths as a result of the subluminal components affecting the behavior of the pulse. Finally, the analysis presents the fundamental limitations of superluminal propagation in light of factors such as the medium depth, pulse width, and the medium dispersion strength.

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Direct Observation of a Pulse Peak Using a Peak-Removed Gaussian Optical Pulse in a Superluminal Medium

Cited by 20 publications

References 26 publications

Nonanalytic pulse discontinuities as carriers of information

Nonanalytic pulse discontinuities as carriers of information

On-resonance material fast light

Time-frequency dynamics of superluminal pulse transition to the subluminal regime

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