New research unlocks the power of exceptional points (EPs) for advanced optical sensing. Unlike traditional methods that require modifications to the sensor itself, the system features an EP control unit that can plug in to physically separated external sensors. This configuration allows EPs to be tuned solely through adjustments to the control unit, allowing for ultrahigh sensitivity without the need for complex modifications to the sensor.

By decoupling the sensing and control functions, it clears the way for EP enhancement to be applied to a wide range of conventional sensors — including ring resonators, thermal and magnetic sensors, and sensors that pick up vibrations or detect perturbations in biomarkers — vastly improving the detection limit of sensors scientists are already using. With the control unit set to an EP, the sensor can operate differently — not at an EP — and still reap the benefits of EP enhancement.

The researchers are currently focused on medical applications, especially working to enhance magnetic sensing, which could be used to improve MRI technology. (Image credit: Washington University)

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