Abstract
Fluorescence properties of crystallographic point defects within different morphologies of titanium dioxide were investigated. For the first time, room-temperature single-photon emission in titanium dioxide optical defects was discovered in thin films and commercial nanoparticles. Three-level defects were identified because the g(2) correlation data featured prominent shoulders around the antibunching dip. Stable and blinking photodynamics were observed for the single-photon emitters. These results reveal a new room-temperature single-photon source within a wide bandgap semiconductor.
Highlights
Single-photon sources offer non-classical states of light [1] and are a prerequisite for future quantum technologies [2]
This form of microscopy allows for high-resolution images that resolve fluorescence signals from individual defects
This study investigated thin films, single crystals and nanopowders of TiO2 via confocal microscopy
Summary
Single-photon sources offer non-classical states of light [1] and are a prerequisite for future quantum technologies [2]. Defects in TiO2 thin films and nanopowders exhibited single-photon emission. Each sample was investigated for fluorescing defects, which were further examined for single-photon emission by observing its photon statistics.
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