Magnetic on-off switching of a plasmonic laser

The nanoscale mode volumes of surface plasmon polaritons have enabled plasmonic lasers and condensates with ultrafast operation. Most plasmonic lasers are based on noble metals, rendering the optical mode structure inert to external fields. Here, we demonstrate active magnetic-field control over las...

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Bibliographic Details
Published in:arXiv.org 2021-08
Main Authors: Freire-Fernández, Francisco, Cuerda, Javier, Daskalakis, Konstantinos S, Perumbilavil, Sreekanth, Jani-Petri Martikainen, Arjas, Kristian, Törmä, Päivi, Sebastiaan van Dijken
Format: Article
Language:English
Subjects:
Active control
Circular polarization
Dichroism
Excitation
Iridium
Lasers
Lasing
Magnetization
Multilayers
Noble metals
Photoluminescence
Plasmonics
Polaritons
Substrates
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Summary:The nanoscale mode volumes of surface plasmon polaritons have enabled plasmonic lasers and condensates with ultrafast operation. Most plasmonic lasers are based on noble metals, rendering the optical mode structure inert to external fields. Here, we demonstrate active magnetic-field control over lasing in a periodic array of Co/Pt multilayer nanodots immersed in an IR-140 dye solution. We exploit the magnetic nature of the nanoparticles combined with mode tailoring to control the lasing action. Under circularly polarized excitation, angle-resolved photoluminescence measurements reveal a transition between lasing action and non-lasing emission as the nanodot magnetization is reversed. Our results introduce magnetization as a means of externally controlling plasmonic nanolasers, complementary to the modulation by excitation, gain medium, or substrate. Further, the results show how effects of magnetization on light that are inherently weak can be observed in the lasing regime, inspiring studies of topological photonics.
ISSN:2331-8422
DOI:10.48550/arxiv.2104.14321