Magnetic on–off switching of a plasmonic laser

Francisco Freire-Fernández*, Javier Cuerda, Konstantinos S. Daskalakis, Sreekanth Perumbilavil, Jani Petri Martikainen, Kristian Arjas, Päivi Törmä, Sebastiaan van Dijken

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)


The nanoscale mode volumes of surface plasmon polaritons have enabled plasmonic lasers and condensates with ultrafast operation1–4. 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 the 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 modulation by excitation5, gain medium6,7 or substrate8. Further, the results show how the effects of magnetization on light that are inherently weak can be observed in the lasing regime, inspiring studies of topological photonics9–11.

Original languageEnglish
Pages (from-to)27-32
Number of pages6
JournalNature Photonics
Issue number1
Early online date2021
Publication statusPublished - Jan 2022
MoE publication typeA1 Journal article-refereed


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