Ultra-high sensitivity having narrow linewidth of the spectral response over nano sensing system

The present invention relates to a kind of ultra-nano-sensing system, particularly relates to a kind of ultra-high-sensitivity Nano-sensing system having a spectral response over a narrow linewidth, including an input optical path along the optical path direction are sequentially disposed, and ultra-nano sensing unit output light path , ultra-nano sensing unit comprises a periodic array of metal above the Bragg gratings and Bragg grating disposed. Nano-sensing system according to the present invention provides a spectral response having ultra-narrow linewidth, improve the sensitivity of the nanosensor, a wide range of potential applications in portable biosensor, drug development and testing, and environmental monitoring.