Cavity-enhanced magnetic dipole resonance induced hot luminescence from hundred-nanometer-sized silicon spheres

Abstract In this paper, we demonstrate the first example of phonon-assisted hot luminescence (PAHL) emission from silicon (Si) spheres (diameter > 100nm) without using plasmonic effect or quantum confinement effect. Instead, excite Si by a strong thin-film-cavity-enhanced magnetic dipole resonance. The thin-film cavity (80 nm SiO 2 /Ag) shows co-enhancement with resonance sphere = 120 nm). concentrated electromagnetic fields induce significant light–matter interaction. Our coupled achieves 10-fold field enhancement relative to an substrate. Furthermore, experimentally use cavity-enhanced 50-fold in PAHL. measured internal efficiency for visible light emitted was approximately 2.4%. tunability peaks merely adjusting sizes thermal oxidation and etching processes. For comparison, calculated peak wavelength ( λ ) sensitivities (Δ /ΔDiameter) QDs through Mie theory effective mass approximation, respectively. predicated ranged 1.3 3.2; they were much more controllable than those (200–400). Thus, wavelengths PAHL could be modulated controlled precisely readily that QDs. With confinement, appears have great potential development all-optical processing based on photonics.