Pump-probe optical response of an asymmetric double quantum dot molecule

Kosionis, Spyridon G.; Paspalakis, Emmanuel

doi:10.1016/j.physe.2015.05.016

Cited by 10 publications

(12 citation statements)

References 43 publications

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“…and χ (5) stand for the first, third-and fifth-order susceptibilities, respectively, defined by www.nature.com/scientificreports www.nature.com/scientificreports/…”

Section: Model and Equationsmentioning

confidence: 99%

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Tunneling induced two-dimensional phase grating in a quantum well nanostructure via third and fifth orders of susceptibility

Vafafard

Sahrai

Hamedi

et al. 2020

Sci Rep

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We study the nonlinear optical properties in an asymmetric double AlGaAs/GaAs quantum well nanostructure by using an external control field and resonant tunneling effects. It is found that the resonant tunneling can modulate the third-order and fifth-order of susceptibilities via detuning frequency of coupling light. In presence of the resonant tunneling and when the coupling light is in resonance with the corresponding transition, the real parts of third-order and fifth-order susceptibilities are enhanced which are accompanied by nonlinear absorption. However, in off-resonance of coupling light, real parts of third-order and fifth-order susceptibilities enhance while the nonlinear absorption vanishes. We investigate also the two-dimensional electromagnetically induced grating (2D-EIG) of the weak probe light by modulating the third-order and fifth-order susceptibilities. In resonance of coupling light, both amplitude and phase grating are formed in the medium due to enhancement of third-order and fifth-order probe absorption and dispersion. When the coupling light is out of resonance, most of probe energy is transferred from zero-order to higher-order directions due to resonant tunneling effect. The efficiency of phase grating for third-order of susceptibility is higher than phase grating for fifthorder susceptibility. Our proposed model may be useful for optical switching and optical sensors based on semiconductor nanostructures.

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“…and χ (5) stand for the first, third-and fifth-order susceptibilities, respectively, defined by www.nature.com/scientificreports www.nature.com/scientificreports/…”

Section: Model and Equationsmentioning

confidence: 99%

“…It is known that the electromagnetically induced transparency (EIT) 1 leads to many appealing optical effects in quantum and nonlinear optics [2][3][4][5][6][7][8] . An important and favorable phenomenon arising from interaction of a standing-wave field with the EIT medium is known as electromagnetically induced grating (EIG) 9 .…”

mentioning

confidence: 99%

Tunneling induced two-dimensional phase grating in a quantum well nanostructure via third and fifth orders of susceptibility

Vafafard

Sahrai

Hamedi

et al. 2020

Sci Rep

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“…In some of these studies, the nonlinear optical effects in an SQD-MNP hybrid structure are examined under interaction with a pump field of high intensity and a tunable probe field of much lower intensity [7,18,23,24,26,28,34,36]. A specific SQD nanostructure that exhibits optical properties of high importance is the asymmetric molecule consisting of a couple of SQDs [39][40][41][42][43][44][45][46][47][48][49][50][51][52]. The band structures of the SQDs are considered to be different from each other, while the rate at which the tunneling effects take place is determined by the value of the applied voltage.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Pump-Probe Optical Response in Asymmetric Tunneling-Controlled Double Quantum Dot Molecule—Metal Nanoparticle Hybrids

Kosionis

Paspalakis

2021

Applied Sciences

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In the present work, we investigate the modified nonlinear pump-probe optical properties due to the excitonic–plasmonic interaction of a double semiconductor quantum dot (SQD) molecule coupled to a metal nanoparticle (MNP). More specifically, we study the absorption and the dispersion spectra of a weak electromagnetic field in a hybrid structure with two counterparts, a molecule of two coupled SQDs, and a spherical MNP driven by a field of high intensity. We solve the relevant density matrix equations, calculate the first-order optical susceptibility of the probe field in the strong pumping regime, and investigate the way in which the distance between the two counterparts modifies the optical response, for a variety of values of the physical constants of the system, including the pump-field detuning, the tunnelling rate, and the energy separation gap associated with the excited states of the coupled SQDs.

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“…During the last years, these interesting optical effects have attracted the scientific interest, both on an experimental, as well as on a theoretical level, in hybrid nanostructures which are composed of SQDs and MNPs [1][2][3][4][5]. The study of the Λ-type system that describes the asymmetric double-SQD system has also attracted the scientific interest of several scientists, who investigated the pump-probe response and the FWM [6,7] and as the Autler-Townes splitting and the tunneling-induced transparency [8,9]. In this work, we are interested in the study of a complex structure in which an asymmetric double-SQD molecule is coupled to an MNP.…”

Section: Introductionmentioning

confidence: 99%

Four-Wave Mixing in Asymmetric Double Quantum Dot Molecule–Metal Nanoparticle Assemblies

Kosionis¹,

Paspalakis²

2020

The 2nd International Online-Conference on Nanomaterials

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In this study, the four-wave mixing (FWM) spectrum of a strongly pumped hybrid structure is theoretically examined. The hybrid structure consists of an asymmetric double semiconductor quantum dot (SQD) molecule and a spherical metal nanoparticle (MNP), which are coupled together via long-range Coulomb interaction. Having as a starting point the Hamiltonian of the system, in the dipole and the rotating-wave approximations, we derive a set of nonlinear density matrix equations, which are numerically solved, in the steady-state limit, and then the FWM coefficient is calculated within a range of values of the pump-probe field detuning. The spectral response of the FWM coefficient is investigated, for different values of the pump-field detuning, the electron-tunneling rate and the energy gap between the upper states in the energy-level scheme of the double SQD molecule, while the interparticle distance between the two components of the structure is modified.

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Pump-probe optical response of an asymmetric double quantum dot molecule

Cited by 10 publications

References 43 publications

Tunneling induced two-dimensional phase grating in a quantum well nanostructure via third and fifth orders of susceptibility

Tunneling induced two-dimensional phase grating in a quantum well nanostructure via third and fifth orders of susceptibility

Controlling the Pump-Probe Optical Response in Asymmetric Tunneling-Controlled Double Quantum Dot Molecule—Metal Nanoparticle Hybrids

Four-Wave Mixing in Asymmetric Double Quantum Dot Molecule–Metal Nanoparticle Assemblies

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