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Keitel, R.C.* ; Aellen, M.* ; Feber, B.L.* ; Rossinelli, A.A.* ; Meyer, S.A.* ; Cui, J. ; Norris, D.J.*

Active mode switching in plasmonic microlasers by spatial control of optical gain.

Nano Lett. 21, 8952–8959 (2021)

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Open Access Green as soon as Postprint is submitted to ZB.

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The pursuit of miniaturized optical sources for on-chip applications has led to the development of surface plasmon polariton lasers (plasmonic lasers). While applications in spectroscopy and information technology would greatly benefit from the facile and active tuning of the output wavelength from such devices, this topic remains underexplored. Here, we demonstrate optically controlled switching between predefined wavelengths within a plasmonic microlaser. After fabricating Fabry-Pérot plasmonic cavities that consist of two curved block reflectors on an ultrasmooth flat Ag surface, we deposit a thin film of CdSe/Cd_xZn_1-xS/ZnS colloidal core/shell/shell nanoplatelets (NPLs) as the gain medium. Our cavity geometry allows the spatial and energetic separation of transverse modes. By spatially modulating the gain profile within this device, we demonstrate active selection and switching between four transverse modes within a single plasmonic laser. The fast buildup and decay of the plasmonic modes promises picosecond switching times, given sufficiently rapid changes in the structured illumination.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Active Control ; Laser Cavity ; Plasmonic Laser ; Structured Illumination ; Surface Plasmon ; Transverse Modes; Laser; Enhancement; Emission

ISSN (print) / ISBN 1530-6984

e-ISSN 1530-6992

Journal Nano Letters

Quellenangaben Volume: 21, Issue: 21, Pages: 8952–8959

Publisher American Chemical Society (ACS)

Publishing Place 1155 16th St, Nw, Washington, Dc 20036 Usa

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Helmholtz Pioneer Campus (HPC)

Grants European Research Council under the European Union's Seventh Framework Program (FP/2007-2013)/ERC Grant