Strongly resonant all-dielectric metasurfaces: emerging applications in telecom and life sciences

This paper provides a critical review of the advancements in strongly resonant all-dielectric metasurfaces, with a focus on their applications in telecommunications and life sciences. By exploring the unique properties of quasi-bound states in the continuum (qBIC) resonances, the paper illustrates how these metasurfaces manipulate light at the nanoscale, enabling unprecedented control and minimal energy loss. These capabilities are crucial for the development of highly efficient optical devices. The emerging applications of these metasurfaces in the development of compact and more efficient telecommunication systems and in enhancing the capabilities of biosensing technologies in life sciences are discussed. The paper aims to highlight both the remarkable potential and the challenges facing the integration of these photonic systems into practical applications, providing a pathway for future innovations. The paper includes some notes on a recently designed metasurface that is specifically intended for refractive index sensing and label-free biosensing. The nanostructured surface is based on complementary split-ring resonators and exhibits a very interesting numerically calculated performance. Some possible future research activities in the field are envisaged.