Boosting transparent electromagnetic interference shielding by multi-cavity resonances

We propose a multi-cavity resonant architecture that is established by employing two opposing ultrathin silver-based films to forma Fabry-Perot (F-P) cavity and inserting one or two metallic mesh layers in between. Compared with the single F-P cavity, the multi-cavity architecture with one metallic mesh layer experimentally exhibits a similar to 37% improvement in the average shielding effectiveness and maintains a transmittance over 80% at 550 nm. A more significant improvement of similar to 108% in shielding effectiveness (SE) can be achieved by inserting two metallic mesh layers. The proposed multi-cavity architecture provides a strategy for removal of the hindrance to transparent electromagnetic interference shielding. (C) 2021 Optical Society of America