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Peak susceptibility in the quantum dot-metal nanoparticle hybrid system under an electromagnetically induced grating

Haneen Akram, Suha Hadi, Amin Habbeb AL-Khursan

Published Sep 29, 2026• 0 citations
Publisher

Abstract

The peak susceptibility of the electromagnetically induced grating (EIG) in the double quantum dot-metal nanoparticle (DQD-MNP) system, which has been very limitedly studied, is investigated in this work. The behavior of peak EIG susceptibility versus interparticle distance and metal nanoparticle MNP radius , which summarizes the susceptibility spectra along these parameters, is investigated for the first time. The results show that the peak DQD susceptibility is shifted to appear at a longer value of the separating DQD-MNP distance when the MNP radius is larger. The shift in where the highest peak appears is in the same range as the increment in the MNP radius . This behavior demonstrates how the MNP field alters the DQD susceptibility. The MNP peak susceptibility is too small. Changing is less effective than . The results show that increasing the probe field shifts the peak to a wider MNP radius. Switching from a parallel probe field to a perpendicular field also gives a similar increase. This behavior occurs when the MNP and DQD fields interfere. The results specify the radius and distance at which the structure gives a high response, which are essential for applications requiring high yield. The main effect of the MNP is an increase in the peak height and a shift of the highest peak to a longer DQD-MNP distance . While it is well known that susceptibility decreases with increasing distance, this study shows how the peak susceptibility varies with the separating distance R . This phenomenon has not been studied previously. The behavior of peak susceptibility versus and summarizes the spectra of susceptibility along these parameters, showing the importance of such figures. The results show that the effective Rabi field, not the applied Rabi field, is affecting the DQD-MNP behavior; it depends on the cubic ratio of . The peak susceptibility depends on this ratio and is arranged accordingly.

DOI
10.1016/j.physo.2026.100492

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The peak susceptibility of the electromagnetically induced grating (EIG) in the double quantum dot-metal nanoparticle (DQD-MNP) system, which has been very limitedly studied, is investigated in this work. The behavior of peak EIG susceptibility versus interparticle distance and metal nanoparticle MNP radius , which summarizes the susceptibility spectra along these parameters, is investigated for the first time. The results show that the peak DQD susceptibility is shifted to appear at a longer value of the separating DQD-MNP distance when the MNP radius is larger. The shift in where the highest peak appears is in the same range as the increment in the MNP radius . This behavior demonstrates how the MNP field alters the DQD susceptibility. The MNP peak susceptibility is too small. Changing is less effective than . The results show that increasing the probe field shifts the peak to a wider MNP radius. Switching from a parallel probe field to a perpendicular field also gives a similar increase. This behavior occurs when the MNP and DQD fields interfere. The results specify the radius and distance at which the structure gives a high response, which are essential for applications requiring high yield. The main effect of the MNP is an increase in the peak height and a shift of the highest peak to a longer DQD-MNP distance . While it is well known that susceptibility decreases with increasing distance, this study shows how the peak susceptibility varies with the separating distance R . This phenomenon has not been studied previously. The behavior of peak susceptibility versus and summarizes the spectra of susceptibility along these parameters, showing the importance of such figures. The results show that the effective Rabi field, not the applied Rabi field, is affecting the DQD-MNP behavior; it depends on the cubic ratio of . The peak susceptibility depends on this ratio and is arranged accordingly.
The main purpose of this work is studying the linear Susceptibility in the hybrid nanostructure that composed of a dual quantum dot (DQD) and metal nanoparticle (MNP) hybrid system under a standing-wave field. In our model, we used density matrix equations by taking into our account the interaction between excitons and surface plasmons. The proposed DQD is composed of two QDs. Each QD contains an InAs QD with a disk shape. The interaction between the QD and the wetting layer (WL) is taken into consideration. The application of the standing wave field on DQD-MNP hybrid system was modeled and examined. The susceptibility of thehybridDQD-MNPsystem reduced by the pump field under a standing-wave field. The high susceptibility obtained with a wide MNP radius. An interesting result was shown in the inversion of the grating period with the tunneling component in the conduction band. The smaller size of DQD gave us high susceptibility due to the quantization effect.
This work studies the energy absorption rates in the case of plasmonic electromagnetically induced transparency (PEIT) from the double quantum dot (DQD)–metal nanoparticle (MNP) system. The orthogonalized plane wave between the wetting layer (WL) and QD transitions is considered. PEIT is not attained under a single applied field. It is obtained under a probe, pump, and two tunneling components. Two asymmetric PEIT windows can result from the transitions between the sixth energy states of the DQD structure. A huge Qtotal value (10−5 W) under 0.2 W/cm2 is obtained. Compared with other works, this result is higher by four orders, and the power applied is less by six orders than that used in earlier works. Our results exceed those obtained with double MNP-QD, QD-six MNP, and MNP-ten QDs. Such a vast result is ascribed to the manipulation flexibility in the DQD system, which is not found in all other structures. This possibility increases quantum correlation and the nonlinear optical properties of the DQD and the DQD–MNP system. The QD ( QQD) and MNP ( QMNP) absorption energy rates are also studied. Applying two tunneling components restores the system to peak at resonance due to the coupled work of the two dots as a DQD system. Strong plasmon–exciton coupling occurs when the probe power becomes considerable. Thus, the probe must not be so small.
We study optical effects in a hybrid system composed of a semiconductor quantum dot (SQD) and a spherical metal nanoparticle (MNP) that interacts with a weak probe and a strong pump electromagnetic field. We use modified nonlinear density matrix equations for the description of the optical properties of the system and calculate, numerically, the first-order susceptibilities of the SQD, the MNP, and the total hybrid nanostructure of the probe field in the presence of the pump field. We investigate the dependence of the probe absorption and dispersion spectra of the SQD, the MNP, and the total nanostructure on the interparticle distance and the detuning of the pump field, and stress the influence of the MNP contribution to the total optical response. The results we find are explained according to the theory of two distinct metastates, which constitute conjugations of the SQD excitonic and the MNP plasmonic excitations. We also show that the optical response strongly depends on the actual values of the SQD material parameters.
The optical polarization from a hybrid system including a closely spaced spherical SQD (modeled as a three-level V-type system) and a metal nanoparticle which are considered classically and are connected by the dipole–dipole interaction mechanism is investigated. The interaction between the SQD and the MNP shows an interesting optical response. In the weak probe field regime and MNP nonlocality correction, the absorption spectrum of the hybrid system exhibits an EIT window with two absorption peaks and the plasmon-assisted quantum interference plays an important role in the position and amplitude of these peaks, which are intensely altered by including the nonlocal effects. The probe diffraction grating is created based on the excitons-induced transparency by applying a standing-wave coupling field. The results of this study are useful in numerous areas of all-optical communications.
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.
We study optical effects in a hybrid system composed of a semiconductor quantum dot and a spherical metal nanoparticle that interacts with a weak probe electromagnetic field. We use modified nonlinear density matrix equations for the description of the optical properties of the system and obtain a closed-form expression for the linear susceptibilities of the quantum dot, the metal nanoparticle, and the total system. We then investigate the dependence of the susceptibility on the interparticle distance as well as on the material parameters of the hybrid system. We find that the susceptibility of the quantum dot exhibits optical transparency for specific frequencies. In addition, we show that there is a range of frequencies of the applied field for which the susceptibility of the semiconductor quantum dot leads to gain. This suggests that in such a hybrid system quantum coherence can reverse the course of energy transfer, allowing flow of energy from the metallic nanoparticle to the quantum dot. We also explore the susceptibility of the metal nanoparticle and show that it is strongly influenced by the presence of the quantum dot.