[10p-E201-1~19] 3.11 Nanoscale optical science and near-field optics

5:30 PM - 5:45 PM JST(8:30 AM - 8:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[10p-E201-15] Visible–NIR Thermal Emission of Spherical Silicon Nanoparticles (II)—Oxidation Suppression by Al₂O₃ Coating

〇(M2)Shintaro Kono¹, Kana Kondo¹, Hiroshi Sugimoto¹, Minoru Fujii¹ (1.Kobe Univ.)

Keywords:

Mie resonance,silicon nanoparticle,thermal emission

We investigate the thermal stability of wavelength-selective visible-to-near-IR emission from spherical silicon nanoparticles mediated by Mie resonances. Bare particles showed no significant shift in the magnetic-dipole resonance wavelength after heating in air at temperatures up to 500^oC for 1 h, whereas heating at 600^oC or higher caused a pronounced blueshift due to thermal oxidation and the resulting decrease in the silicon-core diameter. To suppress this degradation, conformal Al₂O₃ layers were deposited by atomic layer deposition. A particle coated with a 10-nm-thick Al₂O₃ layer retained its scattering spectrum and magnetic-dipole resonance wavelength after heating in air at 600^oC for 1 h. The effects of Al₂O₃ thickness on oxidation suppression and wavelength-selective thermal emission will be discussed.