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Publications (44)
In this work, we theoretically study a novel strategy for electromagnetically induced gratings in a complex hybrid system consisting of semiconductor quantum dots (SQDs) and metallic nanoparticles (MNPs). The plasmonic resonances of MNPs and the quantum coherence of SQDs enable the generation of unique optical phenomena such as electromagnetically...
![The spectral form of the real [(a) and (c)] and imaginary parts [(b)...](publication/384467534/figure/fig2/AS:11431281281099766@1727732035234/The-spectral-form-of-the-real-a-and-c-and-imaginary-parts-b-and-d-of-the_Q320.jpg)
![The spectral form of the real [(a) and (c)] and imaginary parts [(b)...](publication/384467534/figure/fig3/AS:11431281281119910@1727732035430/The-spectral-form-of-the-real-a-and-c-and-imaginary-parts-b-and-d-of-the_Q320.jpg)
![The spectral form of the real [(a) and (c)] and imaginary parts [(b)...](publication/384467534/figure/fig4/AS:11431281281134479@1727732035638/The-spectral-form-of-the-real-a-and-c-and-imaginary-parts-b-and-d-of-the_Q320.jpg)
![The spectral form of the real [(a) and (c)] and imaginary parts [(b)...](publication/384467534/figure/fig5/AS:11431281281152098@1727732035843/The-spectral-form-of-the-real-a-and-c-and-imaginary-parts-b-and-d-of-the_Q320.jpg)
This work examines the third-order and fifth-order nonlinear susceptibilities in a hybrid system including a semiconductor quantum dot, metallic nanoshell, and graphene nanodisk. The research uses the density matrix method to examine the dipole–dipole interaction that occurs due to the applied field. It assumes that there is an increase in the stre...
Nanohybrid structures, consisting of metallic nanoparticles (MNPs) and semiconductor quantum dots (SQDs), display distinct optical characteristics resulting from the interplay between the plasmonic modes of MNPs and the excitonic transitions in SQDs. These interactions improve the interaction between light and matter, resulting in new visual phenom...
In this paper, we have theoretically explored the third-order and fifth-order nonlinear susceptibilities for a semiconductor quantum dot in a hybrid system composed of a semiconductor quantum dot, metal nanoparticle, and graphene nanodisk. We considered the dipole-dipole interaction induced by the applied field assuming continuous-wave electromagne...
This work is a numerical description of the interaction between optical pulses and plasmonic oscillations in nanoparticle composites. We present a numerical demonstration of enhanced second-harmonic generation (SHG) in plasmonic nanoparticles caused by collective resonances. The SHG and dispersion associated with core–shell nanoparticles are studie...
In this study, linear and nonlinear optical absorption has been investigated in a composite consisting of thin film wrapped nano-sphere dielectrics. This type of plasmonic coupled hybridized nano-elements can lay the groundwork for many functional devices. The graphene-based coupled plasmonic structure could benefit from superior plasmons and new c...
In order to investigate optical pulling forces exerted by an electromagnetic field, we develop a theoretical framework based on electrostatic theory and Maxwell stress tensor. We apply this framework to calculate the optical pulling force on elliptical cylinder nanoparticles with gain medium, which we put forward as an alternative material platform...
![Fig. 1. Imaginary part of ε (ω) according to experimental measurement [18].](profile/Tayebeh-Naseri/publication/353391326/figure/fig1/AS:1048468558712832@1626985792919/maginary-part-of-e-o-according-to-experimental-measurement-18_Q320.jpg)
In regards to the interaction between 2D materials and laser beams, electrical conductivity is the cornerstone due to the fact that the optical absorption is correlated to electrical and opto-electrical properties. In this paper, the linear electrical conductivity (σ (1)) and nonlinear properties (σ (2) and σ (3)) for MoS 2 will be investigated the...
In this work, we revisit the optical response of a one-dimensional photonic crystal consisting of graphene monolayers and a plasmonic nanocomposite as a defect layer in the structure. By taking advantage of the modified transfer matrix approach, the analytical solution of the light transmission and field distribution of the photonic crystal are eva...
In this study, we investigate tunable broadband optical cavity via a medium with four-level atoms interacting with two strong pump fields and a weak probe field in an N-type configuration. The results indicate the amplitude of the Stokes field causes an additional control mechanism of the dispersion behavior. Moreover, the four-wave mixing conditio...
In this paper, we study the optical properties and surface plasmon resonance of a bimetallic core-shell spherical nanoparticle exhibiting monolayer graphene coatings. The extinction cross section (Qex) and slow light factor of this structure are investigated. The effect of coated graphene, host medium, and geometrical parameters such as the core ra...
A new approach for diffracting the weak probe beam into higher-order directions is proposed via electromagnetically induced grating in second field quantization formalism, offering a new way for implementations of quantum information with semiconductor quantum dots. The formalism of second field quantization allows describing atoms and photons as a...
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...
In this paper, we study the energy transferred between a pair of acceptor-donor molecules near a graphene-coated metallic nanoparticle by using the Laplace equation in a quasi-static approximation. After performing theoretical calculations and computer simulations, the influence of the system parameters such as the refractive index of the environme...
In this research, the optical absorption condition in a nanostructure slab consisting of three layers of graphene is theoretically investigated. This structure is distinct from the previous models and is a geometrically asymmetric structure. By means of Maxwell equations and the appropriate boundary conditions in the present model, the absorption c...
An artificial molecule consisting of an SQD and an MNR embedded in 3D photonic crystal is proposed to realize EIG. Using the quantum mechanical density matrix approach, we have derived an expression of the absorption coefficient in the SQD in presence of MNR. Nanoparticle geometry can modify the local fields that determine SQD-MNP coupling and to e...
We propose a scheme for intracavity electromagnetically induced transparency and white light cavity via three-level Ladder-type Rb atoms. The system is driven by coherent and incoherent fields. Due to the position dependent atom-field interaction, the tunable optical susceptibility of the probe field can be achieved. By using an incoherent pump fie...
A novel two-dimensional phase and amplitude electromagnetically induced grating is proposed. This model improves the sensitivity of electromagnetically induced grating to the microwave field. The system experiences electromagnetically induced transparency (EIT) via interacting dark resonances. When two-dimensional standing control fields are applie...
In this paper, dual optical bistability in a sandwich structure including graphene monolayers, dielectric layers, and a composite of golden plasmonic nanoparticles layers is proposed and studied. The theoretical and numerical results show that the asymmetric sandwich structure offers suitable dual optical bistability in THz range. Moreover, wide du...
We study the interaction of electromagnetic field with two of the most tunable nanostructure geometries for nanoplasmonics including the magneto-optical nanoshell structure and the spheroidal geometry. We investigate the effect of combining both geometry and magneto-optical properties within the same nanostructure on the field enhancement factor an...
In this study, we investigate the transfer of energy from a donor molecule to an acceptor molecule nearby a spherical multilayer nanoparticle consisting of a core surrounded by two shells (core@shell@shell nanoparticle), with focus on the role of graphene and gain medium in the resonance energy transfer between molecules. We obtain analytical expre...
We study the nonlinear optical response of graphene in nanostructures. The spherical nanoparticle coated with a monolayer of graphene displays enhanced optical Kerr nonlinearity and, consequently, optical bistability and multistability in a broad range of incident optical intensity. This optical bistability significantly appertains on the geometry...
In this study, we investigate the optical bistability of graphene-coated nanoparticles with cylindrical core–shell structure at terahertz frequency, because graphene displays optical bistability and multistability in a broad range of incident optical intensity. The choice of core–shell system is due to its larger local electric field enhancement, w...
Optical response of a complex nanodimer comprising a semiconductor quantum dot via Coulomb interaction to a metal nanorod is analyzed theoretically. Optical bistability (OB) behavior of a coherently coupled exciton-plasmon (plexcitonic) hybrid system under a laser field is investigated. The bistable exciton population in a hybrid metal–semiconducto...
We study the interaction of an electromagnetic field with a core-shell nanostructure and propose a nonlocal effective medium theory for a core-shell structure made of a nonlocal core and a magneto-optical shell cylinder embedded in the host medium. In addition to the appearance of optical bistability and tristability in this system, it is found tha...
In this paper, the effect of radial anisotropy on optical bistability in the cylindrical nanoshells is theoretically investigated within the quasi-static approximation. We consider two cases: when the shell is anisotropic and the core is nonlinear metal and when the core is anisotropic and the shell is a nonlinear metal. The dependence of optical b...
In this paper, optical properties of a hybrid system consisting of a semiconductor quantum dot placed in the vicinity of a metal (plasmonic) na-noparticle with spherical and ellipsoidal symmetry is investigated. An analytical expression for the absorption and dispersion using the density matrix approach via semi-classical theory is derived and nume...
In this paper, electromagnetically induced transparency (EIT) in a system consisting of associated arrays of parallel slabs (metal-dielectric-metal) is studied. The transmission coefficient, the reflection coefficient and the absorption coefficient as function of the incident light frequency by using the transfer matrix method is calculated and num...
A new scheme for obtaining an electromagnetically induced grating (EIG) via biexciton coherence in quantum well nanostructures is developed. It is theoretically shown that exciton spin relaxation and biexciton binding energy have important roles in producing efficient dual electromagnetically induced phase grating. In this structure, due to biexcit...
We study the nonlinear optical response of multilayer metallic nanoparticles driven by an electromagnetic wave, which can show large field enhancement, hence significantly enhancing optical processes. In addition to optical bistability (OB), we find that optical multistability (OM), which plays a more important role in some applications than OB, is...
Some optical properties including the linear and nonlinear susceptibility and electromagnetically induced phase grating (EIG) in graphene under Raman excitation is studied. A single-layer graphene nanostructure driven by coherent and incoherent fields is investigated theoretically. It is revealed that by adjusting the amplitude of control and incoh...
In this paper, the electromagnetic induced transparency in a system consisting of a spherical core-shell nanoparticle embedded in a dielectric medium sandwiched between two metal plates is investigated. The transmission amplitude as function of the incident light frequency is numerically calculated and discussed. Influence of the size of nanopartic...
A new scheme for investigating electromagnetically induced grating (EIG) in the vanishing two-photon absorption condition in a three-level ladder-configuration n-doped semiconductor quantum well is presented. By applying a standing-wave field interacting with the system, the absorption and dispersion of the probe field will change with the spatial...
A new scheme for investigating electromagnetically induced grating (EIG) in the vanishing two-photon absorption condition in a three-level ladder-configuration n-doped semiconductor quantum well is presented. It is shown that EIG could be controlled and enhanced by the intensity of coupling fields, detuning of applied laser fields and interaction l...
We propose a scheme to realize parity-time (PT) symmetry via electromagnetically induced transparency (EIT). It is shown that a vapor of multilevel atoms driven by far-off resonant laser beams, with possibility of interference of two Raman resonances has potential of EIT. Furthermore, this model is highly efficient for investigating parity-time (PT...
A new scheme for investigating electromagnetically induced grating in four-level cascade-type of cold atoms is presented. The novel result indicates that the diffraction efficiency of phase grating is dramatically enhanced due to the presence of an RF-driven field and a diffraction efficiency up to 34% can be obtained. Furthermore, it is found that...
A new scheme to investigate an electromagnetically induced grating in an -type configuration in the presence of a strong-standing coupling field, additional coherent fields, and microwave driven fields is presented. By considering the coherent population trapping (CPT) condition in a four-level microwave driven -type atomic system, a novel nonlinea...
The effect of correlated white noises on the optical bistability behavior of three-level atomic systems is theoretically investigated. Noise-induced bistability is demonstrated in an atomic optical bistable system consisting of three-level atoms in -type configurations confined in an optical ring cavity. The output field as a result of enhanced Ker...
An electromagnetically induced phase grating (EIG) controlled by coherent population trapping (CPT) in a four-level Y-type atomic system is studied. The CPT condition promotes significantly the dispersion of light into the first-order diffraction in constructing a phase modulation grating by transferring energy from zero-order to first-order diffra...
An electromagnetically induced phase grating controlled by spontaneous generated coherence (SGC) in a four-level N-type atomic system is studied. The results indicate that the diffraction efficiency of the phase grating is dramatically enhanced due to the existence of SGC, and an efficient electromagnetically induced phase grating can be obtained....
The optical properties of a four-level atomic system via coherent and incoherent pumping fields are investigated. The giant Kerr nonlinearity with reduced linear and nonlinear absorption, which has a major role in decreasing the threshold of optical bistability (OB), can be obtained with subluminal light propagation via adjusting the intensities of...
