We theoretically and experimentally investigate the optical properties of a subwavelength hole in a thin metallic
film. The microscopic origin of the hole plasmon resonance is a collective state formed by propagating thin film
surface plasmons of wavelengths equal to integer fractions of the hole diameter. We show that the plasmon
resonance depend strongly on the polarization of the incident light. We also, using time-domain terahertz
spectroscopy, demonstrate the first experimental observation of the optical coupling between antibonding film
plasmon modes and perpendicularly polarized light to the film surface.
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