Article

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

Department of Physics and Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education, Wuhan University, Wuhan 430072, China.

Optics Letters (Impact Factor: 3.39). 09/2007; 32(15):2125-7. DOI: 10.1364/OL.32.002125 Source: PubMed

- [Show abstract] [Hide abstract]

**ABSTRACT:**When hybrid systems consisting of metallic nanoparticles and semiconductor quantum dots interact with coherent lights, they can act as nanoparticle "molecules" with their own characteristic collective states. In this paper, we study how one can control the nature (heat or light) and magnitude of the energy dissipation of such molecules. Using this, we explore nanodevices wherein we can require their initial states of operations consume less, more, or similar energies than those of their final states. In particular, we show one can adjust the structural parameters of a nanoparticle molecule such that as a switch or a modulator the amount of its energy consumption during its operating cycle remains unchanged. These results offer new avenues for device applications based on nanoparticle molecules with the promise of energy consumption independent of their operation (repetition) rates. In this study, the diameter of the metallic nanoparticles considered is 7 nm and the quantum dot sizes are about 3 nm.Journal of Nanoparticle Research 14(10). · 2.18 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**We study the generation of tunable gain without inversion in semiconductor quantum dots using plasmonic effects. For this we investigate the impact of localized surface plasmons on coherent nonlinear exciton effects in a quantum dot when it is located in the vicinity of a metallic nanoparticle. It is shown that when such a system is exposed to a laser field and the distance between the quantum dot and the metallic nanoparticle is reduced the initial impact of plasmons is enhancement of the ac-Stark shift in the quantum dot. When this distance is reduced beyond a critical value, the results show abrupt formation of a significant of amount of gain without inversion in the quantum dot. We show that such a 'molecular' gain is associated with the plasmonic metaresonance (PMR) formed via combined effects of laser-induced coherence in the quantum dot and plasmons.Nanotechnology 11/2010; 21(45):455401. · 3.84 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**The interaction of one-dimensional excitons and plasmons is theoretically investigated in semiconductor-insulator-metal nanowires. With the exact potentials presented analytically, the excitonic equation of motion in electron-hole-pair representation in real space is established. The optical properties of the system are derived by numerically calculating the evolution of the excitonic wave function. Linear absorption spectra demonstrate strong exciton-plasmon coupling in the nanostructures. The redshifts of the exciton absorption are found to be a result of interaction between the self-image potential and the indirect Coulomb interaction, of which the former brings the blueshift and the latter gives the redshift. The shifts reach the scale of 10 meV, which can be easily observed in experiment. Moreover, how the exciton-plasmon interaction is controlled by the parameters of the structure is also illustrated.Physical review. B, Condensed matter 08/2012; 86(7). · 3.77 Impact Factor

Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.