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Metal-mesh optical filters are optical filters made from stacks of metal meshes and dielectric. They are used as part of an optical path to filter the incoming light to allow frequencies of interest to pass while reflecting other frequencies of light. Transmission line theory can be applied to metallic meshes to understand how they work and the overall light transmission properties of groups of metallic meshes grouped together. Modeling the properties of these metallic meshes allows for reliable manufacture of filters with the desired transmission properties.

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  • Metal-mesh optical filter (en)
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  • Metal-mesh optical filters are optical filters made from stacks of metal meshes and dielectric. They are used as part of an optical path to filter the incoming light to allow frequencies of interest to pass while reflecting other frequencies of light. Transmission line theory can be applied to metallic meshes to understand how they work and the overall light transmission properties of groups of metallic meshes grouped together. Modeling the properties of these metallic meshes allows for reliable manufacture of filters with the desired transmission properties. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/2-element-transmission-line-model-for-metal-mesh-filters.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/3-element-admittance-transmission-line.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Complex-reflection-transmission_coefficients-in-complex-plane.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Inductive-capacitive-grid-for-metal-mesh-filter.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Metal-mesh-2.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Metal-mesh-low-pass-filters.png
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  • Metal-mesh optical filters are optical filters made from stacks of metal meshes and dielectric. They are used as part of an optical path to filter the incoming light to allow frequencies of interest to pass while reflecting other frequencies of light. Metal-mesh filters have many applications for use in the far infrared (FIR) and submillimeter regions of the electromagnetic spectrum. These filters have been used in FIR and submillimeter astronomical instruments for over 4 decades, in which they serve two main purposes: band-pass or low-pass filters are cooled and used to lower the noise equivalent power of cryogenic bolometers (detectors) by blocking excess thermal radiation outside of the frequency band of observation, and band-pass filters can be used to define the observation band of the detectors. Metal-mesh filters can also be designed for use at 45° to split an incoming optical signal into several observation paths, or for use as a polarizing half-wave plate. Transmission line theory can be applied to metallic meshes to understand how they work and the overall light transmission properties of groups of metallic meshes grouped together. Modeling the properties of these metallic meshes allows for reliable manufacture of filters with the desired transmission properties. (en)
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