Novel H-shaped plasmon nanoresonators for efficient dual-band SERS and optical sensing applications

Abstract

In this letter, we investigate the optical properties of symmetric and asymmetric H-shaped plasmonic nanoresonators that exhibit the pronounced plasmon resonances with a high quality factor. The results show that, the large electromagnetic energy is confined in the nanogaps of H-shaped resonators due to the LC resonances. By introducing the asymmetrical structure, an additional plasmon peak appears due to plasmon hybridization. Moreover, the proposed H-shaped nanoresonators reveal the huge field enhancement and figure of merit in the optical regime, which offer an excellent potential for single or double-frequency surface enhanced Raman scattering and biosensing applications.