Terahertz Imaging Unveils Hidden Information in Layered Structures

Scientists have developed a method using terahertz time-domain spectroscopy (THz-TDS) to extract hidden structural and content information from layered structures. By studying the local symmetrical characteristics of reflected terahertz pulses, the researchers were able to accurately reconstruct the structure and achieve high-contrast imaging at ultralow signal-to-noise ratios. The method has potential applications in inspecting cultural artifacts, coatings, and composites, allowing for the examination of internal architecture without damage.