Revealing high-transmittance metasurfaces via the Bloch-equivalent interface method

The efficiency of metasurfaces is crucial for widespread metasurface applications. To achieve high-efficiency metasurfaces, a thorough investigation of transmittance – which governs the upper bound on the system’s overall energy utilization efficiency – remains critical but is frequently overlooked. A method based on the Bloch mode approach and equivalent interface concept is proposed to enable the in-depth investigation of hightransmittance metasurfaces. This method establishes an intuitive relationship between the transmittance and structural parameters of meta-atoms, clearly elucidating the physical mechanisms of design strategies for both single-layer and bilayer configurations. Built upon the locally periodic approximation, the method is further extended to the device level. The proposed method demonstrates both high efficiency and accuracy in transmittance evaluation for both meta-atoms of various geometries and functional devices, serving as a rapid and robust tool for high-transmittance metasurface applications such as imaging, holography, precision measurement, and beam steering.

Recommended citation: Qin S, Chen Q., Gao Y, et al., "Revealing high-transmittance metasurfaces via the Bloch-equivalent interface method," Optics Communications 596, 132410 (2025). https://www.sciencedirect.com/science/article/pii/S0030401825009381