  We investigate the inhibited spontaneous emission of telecom-band InAs
quantum disks (Qdisks) in InP nanowires (NWs). We have evaluated how the
inhibition is affected by different disk diameter and thickness. We also
compared the inhibition in standing InP NWs and those NWs laying on silica
(SiO2), and silicon (Si) substrates. We found that the inhibition is altered
when we put the NW on the high-refractive index materials of Si.
Experimentally, the inhibition factor $\zeta$ of the Qdisk emission at 1,500 nm
decreases from 4.6 to 2.5 for NW on SiO2 and Si substrates, respectively. Those
inhibitions are even much smaller than that of 6.4 of the standing NW. The
inhibition factors well agree with those calculated from the coupling of the
Qdisk to the fundamental guided mode and the continuum of radiative modes. Our
observation can be useful for the integration of the NW as light sources in the
photonic nanodevices.
