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Electroabsorption properties of 1.3mum InAs/InGaAs/GaAs quantum dot electroabsorption modulator (EAM) are investigated. Onset of absorption to higher electric field suggests the potential to achieve higher optical power handling capability than conventional EAM.
A comprehensive theory of couplings between a cavity and different charge configurations in a quantum dot is developed. It is shown that the quantum anti-Zeno effect is essential for the results obtained by QED experiments. The quantum dynamics of the system employing the quantum master equation is analysed. A Stansky-Krastanov InAs QD grown on a GaAs substrate was assumed, and the only first confined...
Ultrafast density-dependent optical spectroscopic measurements on a quantum dots-in-a-well heterostructure reveal several distinctive phenomena, most notably a strong coupling between the quantum well population and light absorption at the quantum dot excited state.
We propose a new approach to single-photon sources based on metamaterials with hyperbolic dispersion. Highly directional emission and dramatic reduction in spontaneous-emission lifetime due to the singularity in density-of-states leads to an ideal photon gun.
We demonstrate a novel ultra-fast high-contrast switching mechanism of two-level atoms driven by milliwatt picosecond pulse trains in PBG circuits with step-shaped density of states profiles. Possible application as low-threshold, multi-wavelength-channel all-optical transistors is discussed.
We report on cavity quantum electrodynamics effects in high-Q electrically contacted quantum dot-micropillar cavities. The structures show weak coupling and strong coupling via electrooptical tuning as well as single photon emission and low threshold lasing.
The appearance of the two-photon strong-coupling states is analyzed in atomic vs. semi-conductor quantum-dot microcavities. An identical excitation mechanism explains phenomena observed in photon-correlation measurements.
The spin of an electron in an InAs/GaAs quantum-dot molecule is optically prepared and nondestructively measured through trion-triplet states. With two-laser transmission spectroscopy we demonstrate both simultaneously, something not previously accomplished in single quantum dots.
The merit of quantum-dot versus quantum-well lasers is much debated. This paper describes an attempt at an answer by examining intrinsic behavior and underlying physics, using a microscopic theory with a rigorous treatment of scattering.
We report elliptically-polarized fluorescence from colloidal semiconductor quantum dots in a chiral 1-D photonic bandgap microcavity composed of a planar-aligned cholesteric liquid crystal. Antibunched fluorescence proves a polarized single photon source operating at room temperature.
We demonstrate that the sign of detuning of an optical pulse train from quantum dot resonances controls the direction of nuclear spin flips. This effect can produce a narrow, precise distribution of nuclear spin polarizations.
We demonstrate the origin of, and quantify the contributions to, the poor external differential efficiency we observe in InP quantum dot lasers. Injection efficiency limits the internal differential quantum efficiency to 50%.
Surface-plasmon-polariton-enhanced fluorescence from CdSe/ZnS quantum dots (QD) deposited onto patterned gold/PMMA substrates has been observed, and the enhancement related to QD position with regard to the type of surface and nanostructures.
Optical spectra of InAs quantum dot molecules show clear signatures of 2-photon absorption through sequential and simultaneous transitions. Biexcitons can be spatially direct or indirect, producing 2-photon transitions that are unique to molecules.
We present time resolved photoluminescence supported by kldrp modeling of type II quantum dots. In the measured spectra two effects were observed; an initially fast decay time rises dramatically as the number of carriers is depleted, which reduces the optical matrix element, and at the same time, a strong red shift of the emission wavelength is observed.
We present Purcell-enhanced spontaneous emission of colloidal near-infrared quantum dots in silicon photonic crystal waveguides. The lead sulfide quantum dots demonstrated slow-light enhancement from the large local density of states at the band edge.
Evidence of defect reduction in CdTe nanoparticles upon rapid thermal processing is observed using Raman spectroscopy performed in hollow-core photonic crystal fiber. The Raman spectra indicates the reduction of Te-Te defects in the annealed nanoparticles.
We propose an magneto-optical Kerr effect tomography(MOKET) of an electron spin state in a semiconductor quantum dot. This method can measure the quantum spin coherence between spin up and down states.
Microscopic calculations of the dynamics of electrically injected carriers, coupled to LO-phonons in Stranski-Krastanov-grown quantum-dot-emitters are presented. Even though the phonon distribution remains in equilibrium, a substantial carrier heating occurs.
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