Near-Field Analysis of Bright and Dark Modes on Plasmonic Metasurfaces Showin…

Plasmonic metasurfaces are investigated that consist of a sub-wavelength line pattern in an ultrathin (∼10 nm) silver fi lm, designed for extraordinary suppressed transmission (EOST) in the visible spectral range. Measurements with a near-fi eld scanning optical microscope (NSOM) demonstrate that farfi eld irradiation resonantly excites antenna-like (bright) modes that are localized on the m…