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imaging traditionally struggles to view microscopic objects – something they have overcome with an approach called time-resolved nonlinear ghost imaging. Te method combines several advanced detection methods and involves manipulating light and measuring how it travels through an object over time. In their study, published in
ACS Photonics, the researchers proved the technique can capture 3D images of microscopic items by probing 4x4mmx600µm cuboids with terahertz radiation. Te researchers’ imaging
technique allowed them to create precise 3D images of the
‘Terahertz imaging could be used to detect and diagnose skin cancers that are not visible to the naked eye’
cuboids, revealing the chemical and physical properties of items inside, including features as small as 60µm, equivalent to the width of a human hair. Terahertz waves, typically used for identifying objects of 300µm or larger, had not been used for microscopy before, according to the university. “Tis new approach allows
us to see things that are too small or too obscured to be within reach of traditional methods”, Dr Olivieri said. “Reading the story of how light has travelled through an object is often a complex task, but with this process, we
can retrieve the information encrypted, unravelling the multidimensional data to unveil hidden and ‘invisible’ objects at the microscale. Most importantly, terahertz allows us to see through objects that are not transparent with visible light and produce 3D images.” Dr Luke Peters, who also
worked on the study, said: “In medicine, terahertz imaging
could be used to detect and diagnose skin cancers that are not visible to the naked eye. In security, it could be used to improve the resolution of scanners that are used to search people for concealed weapons or explosives, without the need for physical pat-downs or intrusive searches.” He said other applications could include quality analysis
of materials. “In materials science, terahertz imaging could be used to study the properties of new materials and identify defects or impurities that may affect their performance. Our work allows us to expand these capabilities into the microscopic domain. I am enthusiastic about the potential benefit for society,” said Peters.
Microscopic metallic objects distributed throughout a 3D cube, imaged with the new camera
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Loughborough University
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