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Authors
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Aftenieva, O. ; Sudzius, M. ; Prudnikau, A. ; Adnan, M. ; Sarkar, S. ; Lesnyak, V. ; Leo, K. ; Fery, A. ; König, T.A.F.
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Title
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Lasing by template-assisted self-assembled quantum dots
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Date
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17.03.2023
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Number
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60743
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Abstract
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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.
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Publisher
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Wiley
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Wikidata
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Citation
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Advanced Optical Materials 11 (2023) 2202226
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DOI
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https://doi.org/10.1002/ADOM.202202226
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Tags
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