Fano-resonant electric field sensor based on the thin film lithium niobate micro-ring with enhanced sensitivity.

Electric field sensing is vital for applications ranging from telecommunications to biomedical diagnostics, where high sensitivity and compact form factors are increasingly demanded. Traditional photonic integrated electric field sensors, despite leveraging electro-optic effects, often enhance sensitivity by enlarging interaction regions or complex optoelectronic circuits, compromising device scalability and footprint. Here, we demonstrate an electric field sensor on a lithium niobate on insulator (LNOI) platform that enhances sensitivity by leveraging Fano resonance.