Ultrasensitive Exceptional Point Circuit for Enhanced Physiological Sensing

Abstract

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Exceptional points (EPs) are degeneracies in non-Hermitian systems that have emerged as a new way to tailor the system response. Biasing systems at EPs, in particular, has recently been shown to enhance the sensitivity of certain resonant sensors. Here we demonstrate an EP circuit that enables ultrasensitive readout of wireless physiological health sensors based on LC circuits. We show that this circuit can be automatically operated at an EP and exhibit an amplified response to a small perturbation. In vivo experiments show that enhanced sensitivity can be maintained in dynamic living environments for monitoring of respiratory motion.