  We present subwavelength resonant lattices fashioned as nano- and
microstructured films as a basis for a host of device concepts. Whereas the
canonical physical properties are fully embodied in a one-dimensional periodic
lattice, the final device constructs are often patterned in
two-dimensionally-modulated films in which case we may refer to them as
photonic crystal slabs, metamaterials, or metasurfaces. These surfaces can
support lateral modes and localized field signatures with propagative and
evanescent diffraction channels critically controlling the response. The
governing principle of guided-mode, or lattice, resonance enables diverse
spectral expressions such that a single-layer component can behave as a sensor,
reflector, filter, or polarizer. This structural sparsity contrasts strongly
with the venerable field of multi-layer thin-film optics that is basis for most
optical components on the market today. The lattice resonance effect can be
exploited in all major spectral regions with appropriate low-loss materials and
fabrication resources. In this paper, we highlight resonant device technology
and present our work on design, fabrication, and characterization of optical
elements operating in the near-IR, mid-IR, and long-wave IR spectral regions.
Examples of fabricated and tested devices include biological sensors,
high-contrast-ratio polarizers, narrow-band notch filters, and wideband high
reflectors.
