A collaborative research team has successfully visualized in real space the ultrafast optical modulation of hyperbolic phonon polaritons (HPhPs) in a van der Waals heterostructure composed of hBN and WS2. The research is published in the journal Nano Letters, and was led by Kazuki Kamada of the...
Source: [Phys.org](https://phys.org/news/2026-08-femtosecond-nano-imaging-reveals-ultrafast.html)