THz scanning near-field microscopy of HgTe nanocrystals
Résumé
Far-field terahertz imaging is limited by diffraction to resolutions in the tens of micrometers range. On the other hand, near-field optical microscopy is a technique that shows permittivity contrasts at the nanoscale. We present here images of HgTe nanocrystals grown by chemical synthesis in liquid phase. The images are obtained by scattering scanning near-field microscopy at 2.52 THz and show a high contrast compared to the silicon substrate.