A new Terahertz imaging system can see inside solid objects with sub-nanometer precision without damaging them at all.
April 29, 2026
Original Paper
Scientific Evaluation of Unified T-ray Volumetric Metrology and Its Necessity: Advancing Beyond SEM, TEM, AFM, and SIMS Methodologies
SSRN · 6660720
The Takeaway
Inspecting the inside of microchips or biological samples usually requires cutting them open or using destructive electron beams. This T-ray system provides a 3D view of the entire volume of an object while keeping it completely intact. It achieves a level of detail that was previously only possible with surface-level scans or fragmented techniques. This single tool could replace multiple expensive machines used in semiconductor manufacturing and medical research. It allows engineers to find microscopic flaws deep inside complex machines before they ever leave the factory.
From the abstract
The transition toward sub-2nm semiconductor architectures and complex nanostructures has exposed a critical metrological gap: current characterization standards—SEM, TEM, AFM, and SIMS—are fundamentally limited to surface-only or thin-section snapshots. This paper presents a scientific validation of unified Terahertz (T-ray) volumetric metrology as the inevitable successor to these fragmented arts. By integrating the spatial resolution of electron microscopy with the chemical specificity of mass