All-Dielectric Sers Metasurface with Strong Coupling Quasi-BIC Energized by Transformer-Based Deep Learning

Researchers have paid great attention to pursuing metal-free nanostructures as alternatives to metallic counterparts in the field of surface-enhanced Raman scattering (SERS) for label-free sensing. However, these metal-free investigations are hindered by the tiny enhancement factor of the local near field. Here, the design of all-dielectric SERS metasurfaces is proposed with quasi-bound states in the continuum (Q-BIC), inspired by transformer-based deep learning. By manipulating the incident angle, the mechanism of strong coupling Q-BIC is introduced with a large Rabi splitting of approximate to 105 meV, which opens a bandgap and forms an anti-crossing behavior. Compared to conventional approaches, the strong coupling Q-BIC scheme not only boosts an extraordinary SERS enhancement factor of approximate to 107 but also extends the field-enhancing scale up to ten-fold. The theoretical optimization implies overwhelming dominance versus the conventional metallic nanostructure design for SERS. The study denotes an approach to utilize the strong coupling effects of Q-BIC in all-dielectric SERS metasurfaces and will provide essential design guides for more powerful sensing applications based on SERS. By manipulating the incident angle, the mechanism of strong coupling quasi-bound states in the continuum (Q-BIC) is introduced with a large Rabi splitting of approximate to 105 meV, and the strong coupling Q-BIC scheme boosts an extraordinary surface-enhanced Raman scattering enhancement factor up to 1018.image

Automated summary

Researchers have proposed an all-dielectric SERS metasurface design with quasi-bound states in the continuum (Q-BIC) by manipulating the incident angle. This design not only enhances the SERS signal but also extends the field-enhancing scale.