The paper presents the wave functions ψ, probability functions ψψ* and the ground states energy of a nanostructure consisting of a Si QD embedded in SiO2 dielectric medium, which is under bias of varying electrostatic field. Abrupt displacement of the peak of ψψ* at a certain field value is elucidated as the QD emission. The field distribution and the characteristics of the nanostructure quantu...

An InGaAsN single-layer quantum dot ~QD! laser structure was grown on GaAs substrates by metalorganic chemical vapor deposition ~MOCVD!. The ridge-waveguide edge emitting laser diodes ~LD! were fabricated and characterized. We demonstrate room-temperature operation of InGaAsN QD lasers with an emission wavelength of 1078 nm. Electroluminescence spectra as a function of injection current showed ...

Structural and optical properties of InAs quantum dot (QD) chains formed in etched GaAs grooves having different periods from 200 to 2000 nm in [010] orientation are reported. The site-controlled QDs were fabricated by molecular beam epitaxy on soft UV-nanoimprint lithography-patterned GaAs(001) surfaces. Increasing the groove periods decreases the overall QD density but increases the QD size a...

Fluorescence resonance energy transfer (FRET) characteristics, including the efficiency, donor-acceptor distance, and binding strength of six fluorescent protein (FP)-quantum dot (QD) pairs were quantified, demonstrating that FPs are efficient acceptors for QD donors with up to 90% quenching of QD fluorescence and that polyhistidine coordination to QD core-shell surface is a straightforward and...

Quantum dots (QD) have been extensively explored for in vitro and in vivo imaging due to their superior fluorescence properties compared to organic fluorophores. The hydrophobic nature of QD hinders their biomedical applications in biological milieu, therefore many efforts have been made to construct water-soluble QD by substituting the organic surface ligands with hydrophilic moieties. However...

We investigate a quantum dot (QD) in a carbon nanotube (CNT) in the regime where the QD is nearly isolated from the leads. An aluminum single electron transistor (SET) serves as a charge detector for the QD. We precisely measure and tune the tunnel rates into the QD in the range between 1 kHz and 1 Hz, using both pulse spectroscopy and real-time charge detection, and measure the excitation spec...

The interaction between light and quantum-dot (QD) excitons is strongly influenced by the environment in which the QD is placed. We have investigated the interaction by measuring the time-resolved spontaneous-emission rate of QD excitons in different nanostructured environments. Thereby, we have determined the oscillator strength, quantum efficiency and spin-flip rates of QD excitons as well as...

The interfacial instability process is an emerging general method to fabricate nanocrystal-encapsulated micelles (also called micellar nanocrystals) for biological detection, imaging, and therapy. The present work utilized fluorescent semiconductor nanocrystals (quantum dots or QDs) as the model nanocrystals to investigate the interfacial instability-based fabrication process of nanocrystal-enc...

The problem of constructing a univariate rational interpolant or Pad~ approximant for given data can be solved in various equivMent ways: one can compute the explicit solution of the system of interpolation or approximation conditions, or one can start a recursive algorithm, or one can obtain the rational function as the convergent of an interpolating or corresponding continued fraction. In eas...

Lung epithelial cells are extensively exposed to nanoparticles present in the modern urban environment. Nanoparticles, including colloidal quantum dots (QDs), are also considered to be potentially useful carriers for the delivery of drugs into the body. It is therefore important to understand the ways of distribution and the effects of the various types of nanoparticles in the lung epithelium. ...