Researchers observe extremely squeezed directional THz waves in thin semiconductor crystals

https://phys.org/news/2023-05-extremely-thz-thin-semiconductor-crystals.html

"THz waves propagate plasmon polaritons along thin anisotropic semiconductor platelets wavelengths reduced 65X... polaritons propagate with wavelengths 100X shorter than corresponding photon wavelength allowing manipulation of light on smaller scale... first real-space images of THz plasmon polaritons 65X reduced... acoustic plasmon polaritons formed... anisotropy polariton propagation"