Coherent exciton-plasmon interaction in the hybrid semiconductor quantum dot and metal nanoparticle complex

Abstract

We studied theoretically the exciton coherent dynamics in the hybrid complex composed of CdTe quantum dot (QDs) and rodlike Au nanoparticles (NPs) by the self-consistent approach. Through adjusting the aspect ratio of the rodlike Au NPs, the radiative rate of the exciton and the nonradiative energy transfer rate from the QD to the Au NP are tunable in the wide range 0.05-4 ns(-1) and 4.4 x 10(-4) to 2.6 ns(-1), respectively; consequently, the period of Rabi oscillations of exciton population is tunable in the range 0.6 pi-9 pi.

Optical properties of coupled metal-semiconductor and metal-molecule nanocrystal complexes: Role of multipole effects

“…This rateequation approach describes non-coherent interactions at elevated temperatures. Very recently, several theoretical studies were performed for the quantum regime of exciton-plasmon interaction between a SQD/dye and MNP [16,17,18,19]. These studies revealed a novel feature of strongly-interacting hybrid nanocrystals -interference effects.…”

“…At low temperatures and small exciton broadening, the absorption line shapes are described by the Fano formula [20]. However, previous theoretical results [16,17,18,19] were based on the dipole approximation. The dipole approximation is valid when an exciton-MNP distance is large, compared to the sizes of components, and the excitonplasmon interaction is relatively weak.…”

Entangled plasmon generation in nonlinear spaser system under the action of external magnetic field

“…We found that for the obtained solutions (10), one of the roots of the characteristic equation for the linearized system (6) on average values is always equal to zero, while other eigenvalues are satisfied to inequality Re (λ i ) < 0. Thus, the system moves to the boundary of aperiodic stability in the absence of external synchronization.…”

“…The characteristic time of the dipoledipole interactions between NP and QD is in the order of 0.5 · 10 −4 ns, which is much less than the characteristic rate of exciton decay in the QD and is comparable to decay rate of plasmons. This situation corresponds to a strong coupling regime (see [10]). …”

“…Reducing the distance between the NP and QD results in an increase of non-radiative energy exchange in the system. If the Rabi frequency of interaction (for example, a dipole-dipole interaction) between nanoobjects becomes greater than the characteristic times of decay, then a strong coupling arises in the system [10]. A realistic model of the spaser can be based on a compound nanoobject consisting of a metal core and a semiconductor shell [11] or on a distributed system of nanoparticles with complex geometry [12][13][14][15][16].…”