Back Cover: Spatially Resolved Organic Whispering‐Gallery‐Mode Hetero‐Microrings for High‐Security Photonic Barcodes (Angew. Chem. Int. Ed. 46/2023)

Whispering‐gallery‐mode (WGM) microcavities featuring distinguishable sharp peaks in a broadband exhibit enormous advantages in the field of miniaturized photonic barcodes. In their Research Article (e202310263), Zhenhua Gao, Yong Sheng Zhao et al. have developed a surface tension assisted heterogeneous assembly strategy to construct WGM hetero‐microrings through regulating the charge‐transfer (CT) interactions along circular boundaries, which remarkably promotes the security level and encoding capacity of the barcodes.