Direct Observation of Infrared Plasmonic Fano Antiresonances by a Nanoscale Electron Probe

Abstract

In this Letter, we exploit recent breakthroughs in monochromated aberration-corrected scanning transmission electron microscopy (STEM) to resolve infrared plasmonic Fano antiresonances in individual nanofabricated disk-rod dimers. Using a combination of electron energy-loss spectroscopy (EELS) and theoretical modeling, we investigate and characterize a subspace of the weak coupling regime between quasi-discrete and quasi-continuum localized surface plasmon resonances where infrared plasmonic Fano antiresonances appear. This work illustrates the capability of STEM instrumentation to experimentally observe nanoscale plasmonic responses that were previously the domain only of higher resolution infrared spectroscopies.

References in corpus (4)

• Surface plasmon modes of a single silver nanorod: an electron energy loss study
• Probing decoherence through Fano resonances
• Tunable Fano Resonances in Transport through Microwave Billiards
• Vibrational surface EELS probes confined Fuchs-Kliewer modes

Cited by in corpus (4)

• Separating physically distinct mechanisms in complex infrared plasmonic nanostructures via machine learning enhanced electron energy loss spectroscopy
• Optical Polarization Analogs in Inelastic Free Electron Scattering
• Plasmon drag effect with sharp polarity switching
• Spatio-spectral metrics in electron energy loss spectroscopy as a tool to resolve nearly degenerate plasmon modes in dimer plasmonic antennas