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We recently showed (Savini 2012) the use of stacked graded photolithographic capacitive metal-mesh structures on polypropylene substrates to produce a thin flat Wood lens working in a wide (90%) bandwidth. Here an additional impedance-matched layer is designed to improve the original lens efficiency in a wide band around the central frequency of operation.
The use of capacitive metal-mesh structures on polypropylene substrates is routinely used in far infrared astronomy for the purpose of spectral low-pass filtering. The transmission of these filters well below their cut-off frequency follows the well known behavior of a Fabry-Perot etalon due to the fairly achromatic nature and finite thickness of the embedding substrate. We show how it is possible...
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