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/cm^(2),onchip 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.
展开▼
