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The far-infrared (IR) region is rich with information needed to characterizeinterstellar dust and to investigate the cold outer planets of the solar systemand their icy moons. The proposed sub-orbital observatory the BalloonExperiment for Galactic INfrared Science (BEGINS) will utilize cryogenicinstruments to map spectral energy distributions (SEDs) of interstellar dust inthe Cygnus molecular cloud complex. A future high priority flagship missionUranus Orbiter and Probe carrying a net flux radiometer (NFR) will study the insitu heat flux of the icy giants atmosphere to 10 bar pressure. Theseinstruments require far-IR filters to define the instrument spectralbandwidths. Our ultimate goal is to define the instrument bands of BEGINS andthe NFR with linear-variable filters (LVFs) and discrete-variable filters(DVFs). The LVFs and DVFs will be made of metal mesh band-pass filters (MMBF)comprised of a 100 nm thick gold film with cross-shaped slots of varying sizesalong a silicon (Si) substrate with cyclic olefin copolymer (COC)anti-reflection (AR) coatings. We present our progress towards LVFs and DVFswith simulated and measured transmission of a room temperature, non-AR coated,single-band 44 $\mu$m MMBF filter. We have successfully fabricated, measured,and modeled a non-AR coated, room temperature 44 $\mu$m MMBF. The transmissionat room temperature and non-AR coated was measured to be 27\% with a resolvingpower of 11. When COC-AR coated on both sides the transmission is expected toincrease to 69\% with a resolving power of 10.

Cross-Slot Metal-Mesh Bandpass Filters for Far-Infrared Astronomy