Precision of 1,000 times greater than existing methods allows for analysis of samples as small as a millionth of a drop.
Twisted Light Revolutionizes Medical Testing
Researchers from the Australian Research Council Centre of Excellence in Optical Microcombs for Breakthrough Science (COMBS) have developed a groundbreaking method to measure changes in biological fluids using twisted light.
Method
The approach utilizes a chip that combines microscopic spiral phase plates with a microfluidic channel to generate and measure light with orbital angular momentum. By decoding speckle patterns—interference patterns created from scattered light—the researchers measured the twist of light with up to 1,000 times greater precision than existing methods.
Experiment
The system was tested on sugar solutions and hemoglobin, measuring refractive index with accuracy better than one part per million.
Results and Potential Applications
Published in Nature Communications, the work demonstrates significant potential for medical diagnostics. According to the researchers, the method could:
- Enable faster and more sensitive medical tests
- Handle exceptionally small sample volumes
- Lead to compact lab-on-a-chip devices for real-time analysis
Future versions of the technology might integrate optical frequency combs for rapid analysis of complex biological samples.