Metasurfaces have demonstrated unprecedented capabilities in manipulating light with ultrathin and flat architectures. Although great progress has been made in the metasurface designs and function demonstrations, most metalenses still only work as a substitution of conventional lenses in optical settings, whose integration advantage is rarely manifested. We propose a highly integrated imaging device with silicon metalenses directly mounted on a complementary metal oxide semiconductor image sensor, whose working distance is in hundreds of micrometers. The imaging performances including resolution, signal-to-noise ratio, and field of view (FOV) are investigated. Moreover, we develop a metalens array with polarization-multiplexed dual-phase design for a wide-field microscopic imaging. This approach remarkably expands the FOV without reducing the resolution, which promises a non-limited space-bandwidth product imaging for wide-field microscopy. As a result, we demonstrate a centimeter-scale prototype for microscopic imaging, showing uniqueness of meta-design for compact integration..
About the Cover
The image on the cover for Advanced Photonics Volume 2 Issue 6 illustrates the concept of optical encoding with microdroplets controlled by energy transfer at the biointerface. The figure shows a dynamic evolution of energy transfer when biomolecules binds on the droplet interface. Here the microdroplet serves as the active optical resonator, while the biomolecules serve as the gain material. The radiative energy from a single microdroplet is transferred to binding biomolecules, converting dynamic biological information into more than trillions of distinctive photonic barcodes. This research illuminates a beacon for real-time intermolecular interaction, paving a new road for photonic encryption and biosensing.