3 research outputs found
Resonant Scattering of Surface Plasmon Polaritons by Dressed Quantum Dots
The resonant scattering of surface plasmon-polariton waves by embedded
semiconductor quantum dots above the dielectric/metal interface is explored in
the strong-coupling regime. In contrast to non-resonant scattering by a
localized dielectric surface defect, a strong resonant peak in the scattering
field spectrum is predicted and accompanied by two side valleys. The peak
height depends nonlinearly on the amplitude of surface plasmon-polariton waves,
reflecting the feedback dynamics from a photon-dressed electron-hole plasma
inside the quantum dots. This unique behavior in the scattering field peak
strength is correlated with the occurrence of a resonant dip in the absorption
spectrum of surface plasmon-polariton waves due to interband photon-dressing
effect. Our result on the scattering of surface plasmon-polariton waves may be
experimentally observable and applied to spatially selective illumination and
imaging of individual molecules.Comment: 15 pages, 3 figure
Controlling quantum-dot light absorption and emission by a surface-plasmon field
The possibility for controlling the probe-field optical gain and absorption
switching and photon conversion by a surface-plasmon-polariton near field is
explored for a quantum dot above the surface of a metal. In contrast to the
linear response in the weak-coupling regime, the calculated spectra show an
induced optical gain and a triply-split spontaneous emission peak resulting
from the interference between the surface-plasmon field and the probe or
self-emitted light field in such a strongly-coupled nonlinear system. Our
result on the control of the mediated photon-photon interaction, very similar
to the `gate' control in an optical transistor, may be experimentally
observable and applied to ultra-fast intrachip/interchip optical interconnects,
improvement in the performance of fiber-optic communication networks and
developments of optical digital computers and quantum communications.Comment: 7 pages, 15 figure