(Left) Photograph of a 450 GHz lowpass filter that we designed and fabricated for an instrument that will measure the polarization of the cosmic microwave background (CMB) radiation. (Right) Our numerical simulation (red) and measured transmittance spectra are shown for filters made with gold (green) and copper (blue) thin films. Our measurements show good agreement with the predicted spectrum, with high in-band transmittance, an exceptionally sharp cutoff, and excellent high-frequency blocking.
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