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Lasing by Template-Assisted Self-Assembled Quantum Dots
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DOI：10.1002/adom.202202226.png)
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Miniaturized laser sources with low threshold power are required for integrated photonic devices. Photostable core/shell nanocrystals are well suited as gain material and their laser properties can be exploited by direct patterning as distributed feedback (DFB) lasers. Here, the 2nd-order DFB resonators tuned to the photoluminescence wavelength of the QDs are used. Soft lithography based on template-assisted colloidal self-assembly enables pattern resolution in the subwavelength range. Combined with the directional Langmuir-Blodgett arrangement, control of the waveguide layer thickness is further achieved. It is shown that a lasing threshold of 5.5 mJ cm(-)(2) is reached by a direct printing method, which can be further reduced by a factor of ten (0.6 mJ cm(-)(2)) at an optimal waveguide thickness. Moreover, it is discussed how one can adjust the DFB geometries to any working wavelength. This colloidal approach offers prospects for applications in bioimaging, biomedical sensing, anti-counterfeiting, or displays.
Keyword:
confinement self-assembly
distributed feedback laser
quantum dots
soft lithography
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4.6W
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Nanocrystal Film Patterning by Inhibiting Cation Exchange via Electron-Beam or X-ray Lithography.png)
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