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.