| Autor: |
Abdelazim NM; Department of Physics, Lancaster University, Bailrigg, LA1 4YB, UK.; School of Electronic and Computer Science, University of Southampton, Southampton, SO17 1BJ, UK., Fong MJ; Department of Physics, Lancaster University, Bailrigg, LA1 4YB, UK. j.fong@lancaster.ac.uk., McGrath T; Department of Physics, Lancaster University, Bailrigg, LA1 4YB, UK., Woodhead CS; Department of Physics, Lancaster University, Bailrigg, LA1 4YB, UK., Al-Saymari F; Department of Physics, Lancaster University, Bailrigg, LA1 4YB, UK., Bagci IE; School of Computing and Communications, Lancaster University, Bailrigg, LA1 4WA, UK., Jones AT; Department of Physics, Lancaster University, Bailrigg, LA1 4YB, UK., Wang X; Department of Physics, Lancaster University, Bailrigg, LA1 4YB, UK.; Cavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge, CB3 0HE, UK., Young RJ; Department of Physics, Lancaster University, Bailrigg, LA1 4YB, UK. r.j.young@lancaster.ac.uk. |
| Abstrakt: |
Nanoscale variations in the structure and composition of an object are an enticing basis for verifying its identity, due to the physical complexity of attempting to reproduce such a system. The biggest practical challenge for nanoscale authentication lies in producing a system that can be assessed with a facile measurement. Here, a system is presented in which InP/ZnS quantum dots (QDs) are randomly distributed on a surface of an aluminium-coated substrate with gold nanoparticles (Au NPs). Variations in the local arrangement of the QDs and NPs is shown to lead to interactions between them, which can suppress or enhance fluorescence from the QDs. This position-dependent interaction can be mapped, allowing intensity, emission dynamics, and/or wavelength variations to be used to uniquely identify a specific sample at the nanoscale with a far-field optical measurement. This demonstration could pave the way to producing robust anti-counterfeiting devices. |
