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Waveguide Diffraction Grating
This is a schematic of the Waveguide Far-Infrared Spectrometer (WaFIRS) concept.  The top plate is cut away to illustrate the path of the incoming radiation.  Light from the telescope enters the parallel plates on the left hand side via a corrugated feedhorn coupled to a rectangular waveguide.  The radiation is transmitted onto the curved diffraction grating surface, which focuses the spectrally dispersed light onto a linear array of bolometers.  The three colors illustrate the spectral dispersion from the incoming "white" light.

Hardware photos: