  Perovskite based micro- and nano- lasers have attracted considerable research
attention in past two years. However, the properties of perovskite devices are
mostly fixed once they are synthesized. Here we demonstrate the tailoring of
lasing properties of perovskite nanowire lasers via nano-manipulation. By
utilizing a tungsten probe, one nanowire has been lifted from the wafer and
re-positioned its two ends on two nearby perovskite blocks. Consequently, the
conventional Fabry-Perot lasers are completely suppressed and a single laser
peak has been observed. The corresponding numerical model reveals that the
single-mode lasing operation is formed by the whispering gallery mode in the
transverse plane of perovskite nanowire. Our research provides a simple way to
tailor the properties of nanowire and it will be essential for the applications
of perovskite optoelectronics.
