Journal
ACS PHOTONICS
Volume 4, Issue 10, Pages 2446-2452Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b00644
Keywords
on-chip; single mode; colloidal quantum dots; distributed feedback laser; nanosecond pumping
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Funding
- EU through the project ERC-ULPPIC
- EU through the project ICT-NAVOLCHI
- Belgian Science Policy Office (IAP)
- FWO-Vlaanderen
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We report on a hybrid integrated distributed feedback (DFB) laser fabricated using the colloidal quantum dots (QDs)/silicon nitride (SiN) integration platform. The DFB laser is fabricated with a CMOS-compatible process and consists of a waveguide stack in which a QD layer is embedded between two SiN layers to enhance the coupling of the QD to the optical waveguide mode. Following characterization of the intrinsic properties of the CdSe/CdS core/shell QDs using transient absorption spectroscopy, we demonstrate single mode lasing upon nanosecond optical pumping. With a 7 ns pump pulse, the lasing threshold is 270 mu J/cm(2). This result attests to the potential of colloidal QDs as an enabling gain material for integrated SiN photonics, and it showcases the design versatility of hybrid integrated photonics platforms based on colloidal QDs.
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