In-plane confinement of phonon-polaritons (PhPs) in the mid-infrared is key for compact sensors and photonic devices, but such in-plane beam control in isotropic materials requires complex nanopatterning techniques. The authors propose a scalable way to shape PhPs in hBN using lithographically defined cavities, achieving in-plane confinement down to λ/70.
- Bogdan Borodin
- Sergey Lepeshov
- Petr Stepanov
