Population Inversion and Superluminality

Chiao, Raymond Y.

doi:10.1007/978-1-4612-2378-8_10

Cited by 18 publications

(17 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here we note that the physical mechanism that governs the observed superluminal light propagation has been traditionally viewed as "virtual" reshaping [7,25]. In the past, such superluminal light pulse propagation has been widely viewed as the result of the amplification of the pulse's front edge and the absorption of its tail, inspite it had been repeatedly pointed out that such reshaping is actually a "virtual process" [7,25].…”

Section: Discussionmentioning

confidence: 89%

“…More recently, it has been considered [7][8][9][10][11][13][14][15][16][17][18][19][21][22][23][24]] to use various schemes including the anomalous dispersion near an absorption line [8][9][10][11], nonlinear [13] and linear gain lines [14][15][16][17][18][19][22][23][24], active plasma medium [17,21], or in a tunneling barrier [25,26] to observe these effects. Sometimes it is applied [9][10][11]25,26] to observe superluminal propagation of light pulses.…”

Section: Pacs Number(s)mentioning

confidence: 99%

“…In a series of papers [7,18,19,[22][23][24][25][26], Chiao and coworkers showed theoretically that anomalous dispersion can occur inside a transparent material, particularly on the DC side of a single gain line. It was predicted that by using a gain doublet [22], it is possible to obtain a transparent anomalous dispersion region where the group velocity of a light pulse exceeds c with almost no pulse distortion.…”

Section: Pacs Number(s)mentioning

confidence: 99%

“…The earlier work of Chiao and coworkers [7,18,22] predicted that it is possible to study steep anomalous dispersion and negative group velocity in a transparent medium where gain rather than absorption occurs at the interesting frequency regions. It is important to have a transparent medium where the majority of the electromagnetic radiation energy is kept in the light fields rather than being dissipated inside the medium via absorption.…”

Section: A Classical Theory Of Negative Group Velocitymentioning

confidence: 99%

See 3 more Smart Citations

Transparent anomalous dispersion and superluminal light-pulse propagation at a negative group velocity

Dogariu¹,

Kuzmich²,

Wang³

2001

Phys. Rev. A

302

175

View full text Add to dashboard Cite

Anomalous dispersion cannot occur in a transparent passive medium where electromagnetic radiation is being absorbed at all frequencies, as pointed out by Landau and Lifshitz. Here we show, both theoretically and experimentally, that transparent linear anomalous dispersion can occur when a gain doublet is present. Therefore, a superluminal light pulse propagation can be observed even at a negative group velocity through a transparent medium with almost no pulse distortion. Consequently, a negative transit time is experimentally observed resulting in the peak of the incident light pulse to exit the medium even before entering it. This counterintuitive effect is a direct result of the rephasing process owing to the wave nature of light and is not at odds with either causality or Einstein's theory of special relativity.

show abstract

Section: Discussionmentioning

confidence: 89%

Section: Pacs Number(s)mentioning

confidence: 99%

Section: Pacs Number(s)mentioning

confidence: 99%

Section: A Classical Theory Of Negative Group Velocitymentioning

confidence: 99%

See 2 more Smart Citations

Transparent anomalous dispersion and superluminal light-pulse propagation at a negative group velocity

Dogariu¹,

Kuzmich²,

Wang³

2001

Phys. Rev. A

302

175

View full text Add to dashboard Cite

show abstract

“…This counterintuitive phenomenon was explained from the pulse reshaping because of constructive and destructive interferences in the frequency band of anomalous dispersion. In this region, it was shown several times, that the group refractive index ) (ω g n can become negative [12][13][14][15][16][17][18]. In this case, the group velocity, which is defined as:…”

Section: Introductionmentioning

confidence: 99%

Neutralization of LC- and RC-Disturbances with Left-Handed and NGD Effects

Ravelo

2013

AEM

View full text Add to dashboard Cite

This paper focus is on the neutralization technique of the unwanted parasitic effects on radio frequencies (RF) and digital electronic circuits. Most of parasitic effects induced in these circuits can be modeled by RC-and LC-networks. For canceling these disturbing effects, we can proceed with operation as transfer function neutralization in the considered operating frequency bands. The neutralization presented in this paper is developed by using first, a lefthanded (LH) and negative group delay (NGD) circuits inspired from metamaterials. The theoretical approach illustrating the RC-and LC-effects neutralization is described. Synthesis relations enabling to determine the elements of required LH and NGD circuit correctors in function of the perturbation parameters are established. Numerical and experimental demonstrators are presented to validate the technique proposed.

show abstract