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All-dielectric nanoantennas have recently opened exciting opportunities forfunctional nanophotonics, owing to their strong optical resonances along withlow material loss in the near-infrared range. Pushing these concepts to thevisible range is hindered by a larger absorption coefficient of Si and otherhigh-index semiconductors, thus encouraging the search for alternativedielectrics for nanophotonics. In this paper, we employ bandgap engineering tosynthesize hydrogenated amorphous Si nanoparticles (a-Si:H NPs) offering idealfeatures for functional nanophotonics. We observe significant material losssuppression in a-Si:H NPs in the visible range caused by hydrogenation-inducedbandgap renormalization, producing resonant modes in single a-Si:H NPs with Qfactors up to ~100, in the visible and near-IR range for the first time. Inorder to demonstrate light-matter interaction enhancement, we realize highlytunable all-dielectric nanoantennas coupling them to photochromic spiropyran(SP) molecules. We show ~70% reversible all-optical tuning of light scatteringat the high-Q resonant mode, along with minor tunability when out of resonance.This remarkable all-optical tuning effect is achieved under a low incidentlight intensity ~3.8 W/cm2 for UV light and ~1.1*10^2 W/cm2 for green light.

Suppressing Material Loss for Functional Nanophotonics Using Bandgap Engineering