All-optical modulation of localized surface plasmon coupling in a hybrid system composed of photoswitchable gratings and au nanodisk arrays

We conduct a real-time study of all-optical modulation of localized surface plasmon resonance (LSPR) coupling in a hybrid system that integrates a photoswitchable optical grating with a gold nanodisk array. This hybrid system enables us to investigate two important interactions: (1) LSPR-enhanced grating diffraction and (2) diffraction-mediated LSPR in the Au nanodisk array. The physical mechanism underlying these interactions was analyzed and experimentally confirmed. With its advantages in cost-effective fabrication, easy integration, and all-optical control, the hybrid system described in this work could be valuable in many nanophotonic applications.