On-chip single-mode CdS nanowire laser.

ABSTRACT: By integrating a free-standing cadmium sulfide (CdS) nanowire onto a silicon nitride (SiN) photonic chip, we demonstrate a highly compact on-chip single-mode CdS nanowire laser. The mode selection is realized using a Mach-Zehnder interferometer (MZI) structure. When the pumping intensity exceeds the lasing threshold of 4.9?kW/cm2, on-chip single-mode lasing at ~518.9?nm is achieved with a linewidth of 0.1?nm and a side-mode suppression ratio of up to a factor of 20 (13?dB). The output of the nanowire laser is channelled into an on-chip SiN waveguide with high efficiency (up to 58%) by evanescent coupling, and the directional coupling ratio between the two output ports can be varied from 90 to 10% by predesigning the coupling length of the SiN waveguide. Our results open new opportunities for both nanowire photonic devices and on-chip light sources and may pave the way towards a new category of hybrid nanolasers for chip-integrated applications.

SUBMITTER: Bao Q 

PROVIDER: S-EPMC7073330 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature