Low-pass interference filters for submillimeter astronomy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infrared Astronomy, Infrared Filters, Low Pass Filters, Microwave Filters, Radio Astronomy, Submillimeter Waves, Interference, Polyethylenes, Transmissivity

Scientific paper

Low-pass (long-wave transmitting) interference filters, suitable for broadband photometric observations, previously have been constructed from series of capacitive grids stretched on thin Mylar. These filters have the desired optical properties of high transmission, sharp cut-ons, and good blocking at short wavelengths. Their designs, however, do not scale from one wavelength to another and their performance can deteriorate at low temperatures due to differential contraction of the dielectric backing and the supporting structure. The deviation of these early filters from the predicted scaling was due primarily to the difference in refractive index between the backing material and the medium between the grids. In the present paper, filters are described in which dielectric spacers are used, instead of air, as the medium between the grids. This technique has improved the scaling and has reduced the distortion from differential contraction.

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