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Optics Express

Coherent optical spectroscopy of a hybrid nanocrystal complex embedded in a nanomechanical resonator

Huan Wang, Ka-Di Zhu

Published Jul 15, 2010• 6 citations
Publisher

Abstract

We have theoretically investigated a hybrid nanocrystal complex consisted of a metal nanoparticle (MNP) and a semiconductor quantum dot (SQD) embedded in a nanomechanical resonator in the simultaneous presence of a strong control field and a weak probe field. It is shown that the resonance amplification peak of the probe spectrum will enhance dramatically due to the coupling of the plasmon, exciton and nanomechanical resonator. The enhancement increases significantly with decreasing the distance between the metal nanoparticle and a quantum dot, which implies the strong plasmon enhancement effect in this coupled system. The results obtained here may have the potential applications such as tunable Raman lasers and bio-sensors.

DOI
10.1364/oe.18.016175

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We have theoretically investigated a hybrid nanocrystal complex consisted of a metal nanoparticle (MNP) and a semiconductor quantum dot (SQD) embedded in a nanomechanical resonator in the simultaneous presence of a strong control field and a weak probe field. It is shown that the resonance amplification peak of the probe spectrum will enhance dramatically due to the coupling of the plasmon, exciton and nanomechanical resonator. The enhancement increases significantly with decreasing the distance between the metal nanoparticle and a quantum dot, which implies the strong plasmon enhancement effect in this coupled system. The results obtained here may have the potential applications such as tunable Raman lasers and bio-sensors.
We investigate theoretically four-wave mixing (FWM) response and optical bistability (OB) in a hybrid nanosystem composed of a metal nanoparticle (MNP) and a semiconductor quantum dot (SQD) coupled to a nanomechanical resonator (NR). It is shown that the FWM signal is enhanced by more than three orders of magnitude as compared to that of the system without exciton-phonon interaction, and the FWM signal can also be suppressed significantly and broadened due to the exciton-plasmon interaction. As the MNP couples strongly with the SQD, the bistable FWM response can be achieved by adjusting the SQD-MNP distance and the pumping intensity. For a given pumping constant and a fixed SQD-MNP distance, the enhanced exciton-phonon interaction can promote the occurrence of bistability. Our findings not only present a feasible way to detect the spacing between two nanoparticles, but also hold promise for developing quantum switches and nanoscale rulers.
A slow light effect in a hybrid nanocrystal complex composed of a semiconductor quantum dot (SQD) and a metal nanoparticle (MNP) is investigated theoretically. It is shown that a hole induced by coherent population oscillation appears at the absorption spectrum of the probe when an exciton and plasmon interact. Then a slow light effect may become possible. The numerical results further indicate that the slow light effect is greatly modified by the distance between the SQD and the MNP due to the coupling of the exciton and plasmon. For experimental conditions, the group velocity indexes with Gauss distribution and Lorenz distribution of the distance between the SQD and the MNP are evaluated. It is found that for small dispersion, almost the same values of the group velocity index can be obtained in these different distributions.
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.
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.
Abstract 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 induced transparency via interactions with light. Through surface plasmon interactions and quantum dot interdot tunneling, the modification of light diffraction efficiency into higher orders is achievable. Doppler broadening and nonlocality are included in the model to offer a more realistic picture of the system’s behavior in real-world scenarios. Our proposed model shows significant promise for applications in sensing technologies and nanophotonics, where it has the potential to enhance sensitivity and improve the performance of optical devices.