C. Constantin et al., Organometallic chemical vapor deposition of V-groove InGaAs/GaAs quantum wires incorporated in planar Bragg microcavities, J CRYST GR, 207(3), 1999, pp. 161-173
We report the fabrication and the optical properties of dense arrays of str
ained InGaAs/GaAs V-groove quantum wires (QWRs) embedded in wavelength size
planar Bragg microcavities, made using a two-step organometallic chemical
vapor deposition (OMCVD). Growth front evolution and top surface morphology
of GaAs on the corrugated substrate were investigated as a function of the
growth temperature (550-625 degrees C) and the pitch of the V-groove grati
ng (3-0.25 mu m). Based on these studies, a growth temperature of 550 degre
es C and a grating pitch of 0.25 mu m were selected to achieve sizes compat
ible with simultaneous quantum confinement for electron (approximate to 10
nm wide wires) and photon (approximate to 0.25 mu m thick cavities) states.
Reference arrays of uniform, nanometer-size, crescent-shaped, InGaAs QWRs
with densities up to 4QWRs/mu m were realized, exhibiting a narrow (8 meV)
and intense emission from one-dimensional excitonic states at low temperatu
re. Similar QWRs were then successfully embedded in planar microcavities, s
howing brighter (x 50) emission with a strongly reduced linewidth (1 meV) d
ue to resonant coupling between the wire emission and the microcavity modes
. (C) 1999 Elsevier Science B.V. All rights reserved.