On-chip single-mode CdS nanowire laser
Open Access
- 15 March 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Light: Science & Applications
- Vol. 9 (1), 1-5
- https://doi.org/10.1038/s41377-020-0277-0
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/cm(2), on-chip single-mode lasing at similar to 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.This publication has 31 references indexed in Scilit:
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