Dichroism of coupled multipolar plasmonic modes in twisted triskelion stacks.

ABSTRACT: We present a systematic investigation of the optical response to circularly polarized illumination in twisted stacked plasmonic nanostructures. The system consists in two identical, parallel gold triskelia, centrally aligned and rotated at a certain angle relative to each other. Sample fabrication was accomplished through a novel multilevel high-resolution electron beam lithography. This stack holds two plasmonic modes of multipolar character in the near-infrared range, showing a strong dependence of their excitation intensities on the handedness of the circularly polarized incident light. This translates into a large circular dichroism which can be modulated by adjusting the twist angle of the stack. Fourier-transform infrared (FTIR) spectroscopy and numerical simulations were employed to

SUBMITTER: Rodriguez-Alvarez J 

PROVIDER: S-EPMC12397745 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature