Abstract : A novel plasmonic array sensor using wideband sources and a different incident angle in order to increase sensitivity is proposed and analysed for the first time. The sensitivity of the resonance shift used to change the refractive index of 1 × 1023 is 51000 nm/RIU at the wavelength interrogation. The extremely small plasmonic array sensor is a very attractive component because of its promise of a high level of sensitivity, its easy measurement process, and its ease of integration into a sensor system.