Pressure-induced modulation of the confinement in self-organized quantum dots produced and detected by a near-field optical probe
✍ Scribed by A Chavez-Pirson; J Temmyo; H Ando
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 166 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1386-9477
No coin nor oath required. For personal study only.
✦ Synopsis
Near-ÿeld optical probing, or nanoprobing, achieves spatial resolution that surpasses the di raction limit of light and makes possible the luminescence imaging and spectroscopy of single quantum dots in dense arrays of dots. We use optical nanoprobing to study self-organized InGaAs quantum dots grown on (3 1 1)B oriented GaAs substrates. Here, we emphasize a new feature of nanoprobing: pressure-induced strain modulation near the surface. Operating in near-ÿeld optical excitationcollection mode, the probe makes contact with the surface and exerts direct pressure whose main e ect is a compressive uniaxial strain under the probe. By adjusting the applied pressure, we modulate the local strain environment in and around a quantum dot, but still preserve the capability to capture its near-ÿeld luminescence. Nanoprobe pressure e ects modify the conÿnement potential and radiative emission of single quantum dots, and the coupling strength between dots. This opens new possibilities for the study and control of the optical and electronic properties of single-and coupled-quantum dots. ?