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Journal of Physics B Atomic Molecular and Optical Physics

Enhancing Kerr nonlinearity of a strongly coupled exciton–plasmon in hybrid nanocrystal molecules

Zhien Lu, Ka‐Di Zhu

Published Sep 3, 2008• 58 citations
Publisher

Abstract

The optical nonlinearity of hybrid nanocrystal molecules composed of semiconductor and metal nanoparticles with a weak probe in a strong control field is investigated theoretically. Excitons in such a hybrid molecule demonstrate novel optical properties due to the coupling between excitons and plasmons. It is shown that Kerr nonlinear coefficients as functions of the detuning of the control field from the exciton frequency and the centre-to-centre distance between the two nanoparticles are greatly enhanced due to exciton–plasmon couplings.

DOI
10.1088/0953-4075/41/18/185503

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The optical nonlinearity of hybrid nanocrystal molecules composed of semiconductor and metal nanoparticles with a weak probe in a strong control field is investigated theoretically. Excitons in such a hybrid molecule demonstrate novel optical properties due to the coupling between excitons and plasmons. It is shown that Kerr nonlinear coefficients as functions of the detuning of the control field from the exciton frequency and the centre-to-centre distance between the two nanoparticles are greatly enhanced due to exciton–plasmon couplings.
The optical properties of hybrid molecules composed of semiconductor and metal nanoparticles with a weak probe in a strong pump field are investigated theoretically. Excitons in such a hybrid molecule demonstrate novel optical properties due to the coupling between exciton and plasmon. It is shown that a non-absorption hole induced by coherent population oscillation appears at the absorption spectrum of the probe field and there exists slow light effect resulting in the great change of the refractive index. The numerical results indicate that with the different center-to-center distance between the two nanopaticles the slow light effects are greatly modified in terms of exciton-plasmon couplings.
We theoretically investigated optical third-order nonlinearity of a coherently coupled exciton-plasmon hybrid system under a strong control field with a weak probe field. The analytic formulas of exciton population and effective third-order optical susceptibility of the hybrid of a metal nanoparticle (MNP) and a semiconductor quantum dot (SQD) were deduced. The bistable exciton population and the induced bistable nonlinear absorption and refraction response were revealed. The bistability region can be tuned by adjusting the size of metal nanoparticle, interparticle distance and intensity of control field. Our results have perspective applications in optical information processing based on resonant coupling of exciton-plasmon.
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 (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 emergence of hybrid nanostructures has paved a novel path for the development of nanotechnology and next-generation quantum devices.In this study, we report a remarkable enhancement of nonlinear diffraction achieved within a hybrid artificial molecule consisting of a semiconductor quantum dot (SQD) and a metal nanoparticle (MNP).Our findings reveal that the optical nonlinear properties of the hybrid system can be substantially enhanced due to the plasmon resonance of MNP.Specifically, reducing the interparticle distance and the SQD's size while increasing the MNP's size leads to a significant enhancement in the nonlinear phase modulation of the hybrid system.Meanwhile, the absorption spectra exhibit a redshift accompanied by linewidth broadening under the SQD-MNP coupling interaction controlled by geometric parameters, indicating plasmon-exciton energy transfer.On this basis, it is validated that the enhanced nonlinear phase modulation greatly improves the self-imaging visibility and the signal-to-noise ratio, and extends the near-field pattern over more Talbot lengths.We also demonstrate that the far-field diffraction efficiency is tunable via the coupling interaction between the artificial molecule and external fields, which is determined by the geometric structure, photon detuning, and Rabi frequency.For instance, the first-order diffraction efficiency can be increased from 39.58% to 55% if the geometric parameters of the hybrid system satisfy the threshold in non-resonance conditions.Such plasmon-enhanced optical lattices show potential for applications in all-optical modulators and all-optical switches operating at few-photon levels, and may also afford a novel perspective for the design and development of nanophotonics circuits and topological photonic devices.