  Plasmonic hyperbolic metasurfaces have emerged as an effective platform for
manipulating the propagation of light. Here, confined modes on arrays of silver
nanoridges that exhibit hyperbolic dispersion are used to demonstrate and model
a super-resolution imaging technique based on structured illumination
microscopy. A spatial resolution of ~75 nm at 458 nm is demonstrated, which is
3.1 times better than an equivalent diffraction limited image. This work
emphasizes the ability to engineer the properties of confined optical modes and
to leverage those characteristics for applications in imaging. The results of
this work could lead to improved approaches for super-resolution imaging using
designed sub-wavelength structures.
