Lasing in Single Cadmium Sulfide Nanowire Optical Cavities

TL;DR

This paper investigates the lasing mechanism in single cadmium sulfide nanowire cavities, revealing exciton interactions as key to lasing up to 75 K and implications for designing efficient nanowire lasers.

Contribution

It provides a detailed analysis of the temperature-dependent lasing mechanism in CdS nanowires using photoluminescence measurements, highlighting exciton interactions.

Findings

Exciton-exciton interactions are critical for lasing up to 75 K.

Exciton-phonon processes dominate at higher temperatures.

Lasing involves formation of excitons, informing nanowire laser design.

Abstract

The mechanism of lasing in single cadmium sulfide (CdS) nanowire cavities was elucidated by temperature-dependent and time-resolved photoluminescence (PL) measurements. Temperature-dependent PL studies reveal rich spectral features and show that an exciton-exciton interaction is critical to lasing up to 75 K, while an exciton-phonon process dominates at higher temperatures. These measurements together with temperature and intensity dependent life-time and threshold studies suggest that lasing is due to formation of excitons, and moreover, have implications for the design of efficient, low-threshold nanowire lasers.