Formation of Single-mode Laser in Perovskite Nanowire via Nano-manipulation

TL;DR

This paper demonstrates a nano-manipulation technique to convert perovskite nanowire lasers into single-mode whispering gallery mode lasers, enabling customizable lasing properties for optoelectronic applications.

Contribution

It introduces a novel nano-manipulation method to tailor lasing modes in perovskite nanowires, shifting from Fabry-Perot to whispering gallery modes.

Findings

Single-mode lasing achieved via nano-manipulation

Suppression of Fabry-Perot modes

Observation of whispering gallery mode lasing

Abstract

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.