Effect of spontaneously generated coherence (SGC) on the line shapes of absorption, transparency, dispersion and group index of a four-level inverted Y-type atom–lasers coupling system

Hazra, Rohit; Hossain, Md. Mabud

doi:10.1140/epjp/s13360-021-01709-0

Cited by 6 publications

(12 citation statements)

References 35 publications

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“…where, 𝜌 𝑖𝑗 is density matrix operator, and 𝐿𝜌 represent a combination of spontaneous radiative decay terms which are added phenomenologically. By employing a similar procedure 26,37 , we obtain a set of density matrix equations as follows: 1(c)), which stands as a significant factor contributing to the SGC. Here, the physical parameter 𝑝 characterizes the SGC parameter for producing quantum coherence phenomena in the given system 38 .…”

Section: Modelmentioning

confidence: 99%

“…However, there have been quite a few investigations reported on the properties of the SGC without closed-spaced degenerate energy levels, but non-orthogonal dipole moments play a pivotal role in observing SGC under EIT domain in atomic as well as other solid-based media [21][22][23] . In the last few decades, several researchers have studied the feature of the SGC-induced absorption, and dispersion in three and four-level atomic systems using different excitation schemes such as Ʌ-, V-and Ξ- 23 , N- 24 , double Λ- 25 , inverted Y-type 26 etc. The studies revealed that under the effect of SGC, the absorption is much reduced and within the EIT window slope of the normal dispersion is steeper.…”

Section: Introductionmentioning

confidence: 99%

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Controlling Behaviour of Transparency and Absorption in Three-Coupled Multiple Quantum Wells Via Spontaneously Generated Coherence

Mukherjee,

Hazra,

Borgohain

2023

Preprint

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This article presents a coherent phenomenon called spontaneously generated coherence (SGC) under the regime of electromagnetically induced transparency (EIT) in a three-coupled multiple quantum wells. We demonstrate that the presence of SGC in these quantum wells lead to intriguing modifications in the transparency window within the absorption spectrum. At the same time, modification of the dispersive nature is also demonstrated which enables the feasibility of the system in diverse applications based on light propagation. The absorption and dispersion responses are found to be varied by the individual strength of the first and second control fields in presence as well as in absence of SGC in the EIT regime. The positional shifting of the transparency window and simultaneous modifications in the dispersive profiles by tuning the control field detunings of both the first and second control fields are also revealed. Some absorption and dispersion contours are illustrated for getting better insights into the modifications of the optical responses via SGC. Finally, by manipulating the strength of the SGC parameter, we observe the changes in the respective position of the transparency window and dispersion curve. It is expected that the current investigations will pave novel ways for innovative applications in quantum communications, and fabrication of advanced photonic devices.

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Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controlling Behaviour of Transparency and Absorption in Three-Coupled Multiple Quantum Wells Via Spontaneously Generated Coherence

Mukherjee,

Hazra,

Borgohain

2023

Preprint

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“…Particularly, we are interested to study both the two-and three-photon induced coherent optical phenomena, such as EIT, EIA, TPEIT, TPEIA and their related dispersion spectra, group index, FWM, etc by the detection of probe field. To study these various coherent phenomena in the three lasers driven four-level laddertype system involving a Rydberg state, we set up the density matrix equations which are derived from the semi-classical Liouville's equation of motion [17,19,47],…”

Section: Theoretical Modelmentioning

confidence: 99%

“…The EIT and EIA are two-photon induced coherence phenomena where the absorption of the atomic medium remarkably reduces and enhances, respectively. The last few decades have witnessed quite extensive studies of two-photon induced EIT and EIA both theoretically and experimentally due to their potential applications in atomic clocks [15], storage of light pulses [16], spontaneously generated coherence [17], slow and fast light effects [18], optical switching [19], etc. The EIT and EIA phenomena have been extensively studied in the three-or four-or five-or higher-level atom-laser coupling systems which are either generic lambda (Λ), vee (V), ladder (Ξ)-type or some complex combinations of these generic systems [6][7][8][9][10][11][12][13][14][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of coherent optical phenomena in a three lasers driven four-level ladder-type system involving a Rydberg state

Hazra¹,

Hossain²

2022

Laser Phys.

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A comparative theoretical study of two-photon electromagnetically induced transparency (EIT), absorption (EIA) and three-photon electromagnetically induced transparency (TPEIT), absorption (TPEIA) and their associated dispersion and group index profiles are presented by using a four-level ladder-type system of both stationary and moving 85Rb Rydberg atoms. We have observed EIT, EIA and their respective positive and negative dispersive slopes under two-photon conditions, while the TPEIT, TPEIA signals and the respective multiple positive and negative dispersive slopes at around zero detuning of the probe field are observed under the three-photon conditions. It is found that the control and manipulation of the coherent optical responses under three-photon conditions are much richer than the two-photon conditions. The group index profiles related to the dispersion of the medium have been studied under both two- and three-photon conditions to compare and explain the optical switching between the subluminal and superluminal modes of propagation for both stationary and moving atomic medium. The influence of the ‘pump’ Rabi frequency on the group index has also been investigated to illustrate the action of optical switching. Finally, the existence of the four-wave mixing (FWM) process due to the action of three optical fields in the EIT medium is also discussed.

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“…Substituting equations (27)-(29) and equations (45)-(47) into equation(22), and using the initial conditions r »…”

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confidence: 99%

Influence of spontaneously generated coherence on absorption, dispersion, and group index in a five-level cascade atomic system

et al. 2023

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By solving the density matrix equations in the steady state, we have derived analytical expressions for the absorption, dispersion and group index of a five-level cascade-type atomic system as functions of laser intensity and frequency, spontaneously generated coherence (SGC) and relative phase of applied fields. The influences of SGC and relative phase on absorption, dispersion and group index of this system under electromagnetically induced transparency (EIT) are studied. It is shown that the three EIT windows of system become deeper and narrower as the SGC increases. These lead to an increase in the slope and the amplitude of the dispersion curves at three EIT windows. As a result, the amplitude of the group index at these three EIT windows also becomes larger when the SGC increases. In particular, the group index can easily be switched between negative and positive values i.e., the light propagation can easily be converted between superluminal to subluminal modes by adjusting the strength of the SGC, relative phase or the coupling laser intensity.

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Effect of spontaneously generated coherence (SGC) on the line shapes of absorption, transparency, dispersion and group index of a four-level inverted Y-type atom–lasers coupling system

Cited by 6 publications

References 35 publications

Controlling Behaviour of Transparency and Absorption in Three-Coupled Multiple Quantum Wells Via Spontaneously Generated Coherence

Controlling Behaviour of Transparency and Absorption in Three-Coupled Multiple Quantum Wells Via Spontaneously Generated Coherence

Theoretical study of coherent optical phenomena in a three lasers driven four-level ladder-type system involving a Rydberg state

Influence of spontaneously generated coherence on absorption, dispersion, and group index in a five-level cascade atomic system

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