0000000000185745

AUTHOR

F Bickel

showing 3 related works from this author

A Novel Method Of Measuring Light Absorption On A Self-Assembled Single Quantum Dot

2005

Abstract. We present a novel method by wich excitonic interband optical transitions within single InAs self-assembled quantum dots can be directly observed in a transmission experiment. Due to the extremely high resolution of the tecnique, individual peaks associated to single exciton absorption resonances in single quantum dots can be spectrally resolved. Using this technique we investigate the oscillator strength, homogeneous linewidth and fine structure splitting in a collection of such individual resonances.

Physicsbusiness.industryOscillator strengthExcitonCondensed Matter::Mesoscopic Systems and Quantum Hall EffectMolecular physicsSelf assembledLaser linewidthHomogeneousQuantum dotOptoelectronicsFine structureAbsorption (electromagnetic radiation)business
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Absorption spectroscopy of single InAs self-assembled quantum dots

2004

Abstract Excitonic transitions of single InAs self-assembled quantum dots were directly measured at 4.2 K in an optical transmission experiment. We use the Stark effect in order to tune the exciton energy of a single quantum dot into resonance with a narrow-band laser. With this method, sharp resonances in the transmission spectra are observed. The oscillator strengths as well as the homogeneous line widths of the single-dot optical transitions are obtained. A clear saturation in the absorption is observed at modest laser powers.

Materials scienceAbsorption spectroscopyExcitonResonanceCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter PhysicsLaserAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic Materialslaw.inventionsymbols.namesakeStark effectQuantum dot laserlawQuantum dotsymbolsQuantum-optical spectroscopyAtomic physicsPhysica E: Low-dimensional Systems and Nanostructures
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Exciton fine structure splitting of single InGaAs self-assembled quantum dots

2004

Abstract We show how the resonant absorption of the ground state neutral exciton confined in a single InGaAs self-assembled quantum dot can be directly observed in an optical transmission experiment. A spectrum of the differential transmitted intensity is obtained by sweeping the exciton energy into resonance with laser photons exploiting the voltage induced Stark-shift. We describe the details of this experimental technique and some example results which exploit the ∼1 μeV spectral resolution. In addition to the fine structure splitting of the neutral exciton and an upper bound on the homogeneous linewidth at 4.2 K , we also determine the transition electric dipole moment.

PhysicsPhotonExcitonCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter PhysicsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsElectric dipole momentLaser linewidthQuantum dotFine structureAtomic physicsGround stateBiexcitonPhysica E: Low-dimensional Systems and Nanostructures
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