Fig. 1: Optical extinction spectra of Pd nanoparticles in a periodic array.
From: Inverse designed plasmonic metasurface with parts per billion optical hydrogen detection
a Schematic of the sample. b A collage of experimental (red) and simulated (blue) extinction spectra at normal-incidence from Pd nanodisk square arrays of fixed height, h, of 45 nm and PMMA layer thickness, tPMMA, of 200 nm. The pitch of the array, a, increases from left to right from 300 to 600 nm. The nanodisk diameter increases from top to bottom from 70 to 180 nm. For comparison, the leftmost panels plot the extinction cross-sections (in m2) of the corresponding isolated single particles (a = ∞). Arranging the nanodisks in periodic arrays results in distinct optical spectra compared to their isolated single particle counterparts. The spectra comprise peaks originating from hybrid RA-LSPR modes—the SLR, see main text for details. Gray dashed lines are a guide to the eye to the position of corresponding extinction peaks as a function of particle diameter.
