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- Title
All-optical switching of an epsilon-near-zero plasmon resonance in indium tin oxide.
- Authors
Bohn, Justus; Luk, Ting Shan; Tollerton, Craig; Hutchings, Sam W.; Brener, Igal; Horsley, Simon; Barnes, William L.; Hendry, Euan
- Abstract
Nonlinear optical devices and their implementation into modern nanophotonic architectures are constrained by their usually moderate nonlinear response. Recently, epsilon-near-zero (ENZ) materials have been found to have a strong optical nonlinearity, which can be enhanced through the use of cavities or nano-structuring. Here, we study the pump dependent properties of the plasmon resonance in the ENZ region in a thin layer of indium tin oxide (ITO). Exciting this mode using the Kretschmann-Raether configuration, we study reflection switching properties of a 60 nm layer close to the resonant plasmon frequency. We demonstrate a thermal switching mechanism, which results in a shift in the plasmon resonance frequency of 20 THz for a TM pump intensity of 70 GW cm−2. For degenerate pump and probe frequencies, we highlight an additional two-beam coupling contribution, not previously isolated in ENZ nonlinear optics studies, which leads to an overall pump induced change in reflection from 1% to 45%. All-optical switching is important for integrated-photonics and communication devices. Here the authors demonstrate all-optical switching of an Epsilon-Near-Zero plasmon resonance using indium tin oxide thin film.
- Subjects
INDIUM tin oxide; RESONANCE; OXIDE coating; NONLINEAR optics; MODERN architecture
- Publication
Nature Communications, 2021, Vol 12, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-021-21332-y