We report the fabrication of GaAs/AlGaAs quantum well wires using impl
antation of As at 45 keV to induce quantum well intermixing. The inter
mixing process was first characterized giving optimized annealing para
meters of 875 degrees C for 30 s and an implantation dose of 1x10(13)
cm(-2). Win widths from 35 to 1000 nm were defined using e-beam lithog
raphy followed by lift-off. Photoluminescence spectra from the lateral
wells and barriers were observed from samples with wires as narrow as
50 nm. The energies of the lateral wells were found to remain constan
t for wire widths between 1000 and 150 nm, and start to shift signific
antly towards high energy for 80 nm wires, the signal from the lateral
well eventually merging with that from the lateral barrier for 35 nm
wires. An intermixing radius of about 17 nm was estimated for the proc
ess. Photoreflectance measurements were also carried out on these wire
samples, showing that the wires appear to have a parabolic lateral po
tential and clear interwire coupling was observed from samples with ba
rriers narrower than 50 nm. (C) 1998 American Institute of Physics.