A new study in Light: Advanced Manufacturing reports a compact optical device that could support faster, label-free tissue analysis in histopathology.
Histopathology is essential for diagnosing diseases such as cancer, but current workflows can be slow and depend on tissue staining and manual review. One alternative approach is polarimetric imaging, which analyzes how tissue changes the polarization of light. This method can reveal structural differences between healthy and diseased tissue without additional preparation, but existing systems are often complex and time-consuming to use.
In this study, researchers developed a small, metasurface-based polarimeter that can measure the full polarization state of light in a single step. Unlike conventional systems that require multiple sequential measurements, this device captures all necessary data at once, which could reduce imaging time and simplify workflows.
The device works by splitting incoming light into several components, each representing a different polarization signal. These signals are then combined to reconstruct detailed information about how light interacts with the tissue. After calibration, the system showed accuracy comparable to a commercial polarimeter, with only small measurement differences.
To explore its relevance for pathology, the researchers tested the system on a model designed to mimic a biopsy sample with cancer-like features. The device was able to detect differences in how light was scattered in different regions, with lower polarization signals in areas representing tumor tissue. These patterns were consistent with results from an established system.
The findings suggest that this type of technology could help distinguish tissue types based on their physical structure, potentially supporting diagnostic workflows without the need for staining. It may also enable faster data acquisition and reduce variability linked to manual interpretation.
However, the authors note that further development is needed before clinical use. Challenges include improving performance in real tissue samples, which can produce more variable signals, and increasing the system’s sensitivity and dynamic range.
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