Quantum Optics in Nanostructures

Vladimirova, Yu. V.; Zadkov, Victor N.

doi:10.3390/nano11081919

Cited by 17 publications

(9 citation statements)

References 185 publications

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“…The localized (bound) states can be found embedded in the continuum of propagating mode [57]. This kind of modes usually is called bound states in the continuum [58]. Such type of localized states differs from defect states in the band gap spatially localized by electron Bragg reflectors [58].…”

Section: Discussionmentioning

confidence: 99%

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Nonlinear localized states near the interface with nonlinear response between the medium with a parabolic index spatial profile and Kerr-type medium

Savotchenko

2024

Phys. Scr.

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The interface with nonlinear response separating the parabolic graded-index and the Kerr nonlinear media are considered. Exact solutions to the nonlinear Schrödinger equation with nonlinear short-range potential and a parabolic spatial profile are found applying to the theoretical description of the stationary states localized near interface with nonlinear properties. Localized states with continuous/discrete energy spectrum are described by the Whittaker function / Hermite polynomials in the medium with a parabolic profile of characteristic and the hyperbolic cosine (sine) in the medium with a self-focusing/defocusing Kerr nonlinearity. The field localization length is wider in the case of a self-focusing nonlinearity than in the case of a defocusing one. The maximum of the wave function is located in a nonlinear medium in the case of a self-focusing nonlinearity and at the interface in the case of a defocusing one. It is shown the possibility of a motion closer to the interface (or away from it) the maximum intensity of the localized state by changing the values of the interface response parameters at the fixed localization energy. A growth of the width of the parabolic graded-index layer adduced an increase in the maximum height of localized states of discrete spectrum and theirs localization length in the graded-index layer, but it had almost no effect on the profile of localized states of the continuous spectrum.

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Section: Discussionmentioning

confidence: 99%

“…This kind of modes usually is called bound states in the continuum [58]. Such type of localized states differs from defect states in the band gap spatially localized by electron Bragg reflectors [58]. However, the localized states in the continuum are discovered recently in Bragg resonators with an anisotropic defect layer [59,60].…”

Section: Discussionmentioning

confidence: 99%

Nonlinear localized states near the interface with nonlinear response between the medium with a parabolic index spatial profile and Kerr-type medium

Savotchenko

2024

Phys. Scr.

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“…An electromagnetic field with electric field E(t) = Ẽ0 e −iωt + Ẽ * 0 e iωt , where Ẽ0 is the electric field amplitude and ω the angular frequency, is applied to the system. The electric field that interacts with the quantum dot is modified by the existence of the plasmonic nanoparticle and it is given in the quasi-static limit by E 0 = l(ω, d) Ẽ0 [47][48][49], where the modification factor reads…”

Section: Theorymentioning

confidence: 99%

Optical Absorption Coefficient and Refractive-Index Change in a Coupled Quantum Dot-Metallic Nanoparticle Structure

Evangelou

2023

Photonics

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In the present work, we investigate the problem of the optical absorption coefficient (OAC) and refractive-index change (RIC) in a semiconductor quantum dot placed in the vicinity of a spherical metallic nanoparticle. We derive the total OAC and RIC from the density-matrix equations through different approaches, one without approximations and the other keeping only linear and third-order nonlinear terms. The derived formulae are then applied in a specific hybrid nanostructure to calculate the OAC and RIC. The results obtained from the derived formulae are used to compare cases of various interparticle distance values and applied light intensities and find that, although for specific distances and intensities the formulae may give similar results, in general, they give different results. Moreover, it becomes clear that the distance between the quantum dot and the metallic nanoparticle, in combination with the polarisation of the light field, plays a significant role in the OAC and RIC of the quantum dot. Expressly, conditional on the polarisation of the applied electric field, the OAC and RIC of the quantum dot can be either enhanced or suppressed close to the metallic nanoparticle compared to their values in the absence of the metallic nanoparticle.

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“…In recent years, the optical properties of QSs near plasmonic nanostructures have attracted a considerable interest in the area of nanophotonics due to the influence of the plasmonic nanostructures on the electromagnetic (EM) fields around them. In particular, the surface plasmon resonances occurring in metallic nanoparticles (MNPs) enable strong light-matter interaction between the QS and the plasmonic nanoparticle, which modifies the Rabi frequencies [8][9][10][11][12][13] and the free-space spontaneous decay rates of the QS [14][15][16][17][18][19], according to the size, the shape and the material of the nanostructure.…”

Section: Introductionmentioning

confidence: 99%

Stimulated Raman adiabatic passage in a quantum system near a plasmonic nanoparticle

Δομένικου

Thanopulos²,

Stefanatos³

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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We investigate theoretically the population transfer process in a Λ-type three-level quantum system near a metallic nanosphere using the Stimulated Raman Adiabatic Passage (STIRAP) technique. We combine density matrix quantum dynamical calculations with first-principle electromagnetic calculations, which quantify the influence of the plasmonic nanoparticle on the electric field of the pump and Stokes pulses in STIRAP as well as on the spontaneous emission rates within the Λ-type system. We study the population transfer process by varying the free-space spontaneous emission rate, the distance of the quantum system from the nanosphere, the polarization direction with respect to the nanoparticle surface and the relative strength of the pump and Stokes pulses used in STIRAP. We find that when the pump and Stokes fields have tangential and radial polarizations with respect to the nanosphere surface, the transfer efficiency is improved due to the increase of the decay rate of the excited state to the target state relatively to the decay to the initial state. The optimal population transfer is achieved for small interparticle distances, moderate free space spontaneous decay rate, large values of the pump Rabi frequency and small values of the Stokes Rabi frequency. When we exchange the polarization directions of the pump and Stokes fields we can still find a range of parameters where the population transfer remains efficient, but larger Stokes Rabi frequencies are necessary to overcome the increased decay rate from the excited state back to the initial state.

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Quantum Optics in Nanostructures

Cited by 17 publications

References 185 publications

Nonlinear localized states near the interface with nonlinear response between the medium with a parabolic index spatial profile and Kerr-type medium

Nonlinear localized states near the interface with nonlinear response between the medium with a parabolic index spatial profile and Kerr-type medium

Optical Absorption Coefficient and Refractive-Index Change in a Coupled Quantum Dot-Metallic Nanoparticle Structure

Stimulated Raman adiabatic passage in a quantum system near a plasmonic nanoparticle

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