Thermal near-field tuning of silicon Mie nanoparticles

Artyom Assadillayev, Tatsuki Hinamoto, Minoru Fujii, Hiroshi Sugimoto, Søren Raza*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Tunable high-refractive-index nanostructures are highly desired for realizing photonic devices with a compact footprint. By harnessing the large thermo-optic effect in silicon, we show reversible and wide thermal tuning of both the far-A nd near-fields of Mie resonances in isolated silicon nanospheres in the visible range. We perform in situ heating in a transmission electron microscope and electron energy-loss spectroscopy to show that the Mie resonances exhibit large spectral shifts upon heating. We leverage the spectral shifts to demonstrate near-field tuning between different Mie resonances. By combining electron energy-loss spectroscopy with energy-dispersive X-ray analysis, we show a reversible and stable operation of single silicon nanospheres up to a temperature of 1073 K. Our results demonstrate that thermal actuation offers dynamic near-field tuning of Mie resonances, which may open up applications in tunable nonlinear optics, Raman scattering, and light emission.

Original languageEnglish
Issue number16
Pages (from-to)4161-4169
Publication statusPublished - 2021


  • Electron energy-loss spectroscopy
  • High-refractive-index nanostructures
  • Mie resonances
  • Near-field tuning
  • Thermo-optic tuning


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