ArticleNano letters2025
A Correlative Study of Plasmonic Metasurfaces by Electron Energy-Loss Spectroscopy and Optical Spectroscopy: From Nanoscale Hotspots to Macroscale Optical Response.
Article in Nano letters, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We present a dual probe study of plasmonic metasurfaces using both electron energy-loss spectroscopy and optical spectroscopy. By fabricating plasmonic metasurfaces on ultrathin membranes, we enable both optical reflection and transmission spectroscopy, alongside electron transmission microscopy (TEM). This dual-probe technique provides a comprehensive insight into the energy absorption mechanisms and allows a precise spatial mapping of plasmonic hotspots at the metallic nanostructures. Finite element simulations were employed to optimize the metasurface geometry for obtaining high-intensity localized surface plasmon resonances (LSPRs) in the visible range, identify plasmonic hotspots, and elucidate experimentally observed resonance modes. By comparing the spectra obtained by the two methods with simulations, we identify the dominating dipole LSPR modes of Al nanodiscs placed on 200 nm tall SiO
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