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We present a plasmon-induced absorption (PIA) sensor formed by using a notched metallic film and a metallic ground plane separated by dielectric gratings, suggesting perfect absorption and high sensitivity up to∼ 10 5. The absorption mechanism for the narrow-band sensor involves the phase-dependent coupling between the localized surface plasmon resonance and the Fabry–Perot resonance. The intensity and lineshape of the PIA resonance can be controlled by optimizing the coupling distance and thickness of the dielectric gratings, respectively. In particular, the underlying physics and critical condition for pronounced PIA resonance are illustrated by the coupled Lorentzian oscillator model.