I will introduce two very different chalcogenide thin films that exhibit plasmonic or plasmonic-like behaviour in the visible spectrum. The first film is elemental tellurium and we argue that this plasmonic-like behaviour is due to partially delocalised p-orbital electrons that are readily polarized at frequencies in the visible spectrum.The Te films can support surface plasmon polariton-like modes and Te nanodiscs can support local surface plasmon resonances.We believe these results might pave the way for elemental Te-programmable photonics.
I will also show how chalcogenide films can be used to grow silver nanoparticles over large areas. In particular, I will show how co-depositing Sb2S3 with Ag results in a perfect absorber material consiting of self-organised nanoresonators. We call this material Black Silver, and we have used it to detect femtomolar concentrations of streptavidin.
Antimony trisulfide (Sb2S3) is an Earth abundant material that is transparent to visible and near infrared light (N-IR). Switching the material between amorphous and crystalline states causes radical property changes that deem it useful for programming the response of visible and N-IR photonics devices. We have demonstrated how Sb2S3 can be used to program high resolution micro-displays, dielectric metasurfaces, hyperbolic metamaterials, waveguides, and all-optical neural networks. This presentation will discuss these demonstrations and the underlying physics responsible for the phase transition in Sb2S3.
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