Frequency decoupled coding meta-mirror by combining propagation phase with geometric phase

Frequency decoupling in single resonance is crucial for various applications both in optical and microwave regions. Here, we develop a completely dual-frequency decoupled strategy in single meta-atom for independent phase and amplitude control by combining propagation with geometric phases. As a proof of concept, the bi-functionalities of multifocal shaping with uniform amplitude at two different frequencies have been experimentally demonstrated. This scheme may pave a new route for multi-mode detection, communication and imaging applications.