𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Near Field Optical Spectroscopy of Confined Excitons

✍ Scribed by Lienau, Ch. ;Emiliani, V. ;Guenther, T. ;Intonti, F. ;Elsaesser, T. ;Nötzel, R. ;Ploog, K.H.

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
236 KB
Volume
178
Category
Article
ISSN
0031-8965

No coin nor oath required. For personal study only.

✦ Synopsis

Two novel approaches for mapping the microscopic carrier dynamics in semiconductor nanostructures in real space and time are discussed. Combining quasi two-color femtosecond pump±probe spectroscopy and near-field microscopy, the temporal evolution of the nonlinear change in reflectivity of a single GaAs quantum wire is imaged with a time resolution of 200 fs and a spatial resolution of 200 nm. The experiments evidence the ultrafast relaxation of carriers into a quantum wire at room temperature and carrier transport along the wire axis. The second approach is based on an optical marker technique using a novel electronically coupled wire±dot sample grown on (311)A GaAs substrates. First low temperature near-field spectra reveal the interesting properties of this nanostructure.

📜 SIMILAR VOLUMES

Near-Field Optical Imaging and Spectrosc
Near-Field Optical Imaging and Spectroscopy of Single GaAs Quantum Wires
✍ Emiliani, V. ;Intonti, F. ;Lineau, Ch. ;Elsaesser, T. ;N�tzel, R. ;Ploog, K.H. 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 226 KB 👁 2 views

Low-dimensional semiconductor structures grown by molecular beam epitaxy on a patterned (311)A GaAs substrate are investigated by near-field spectroscopy at a temperature of 10 K. In particular, the two-dimensional potential profiles of quantum wire and coupled wire-dot structures are determined fro