Guided mode resonance flat-top bandpass filter for terahertz telecom applications

In this work, we design and experimentally demonstrate a novel terahertz (THz) filter exhibiting a flattened spectral response in the atmospheric transmission window around the central frequency of 300 GHz. The innovative concept behind this filter is the coupling of Fabry-Perot and guided mode reso...

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Bibliographic Details
Published in:Optics letters 2019-09, Vol.44 (17), p.4239-4242
Main Authors: Ferraro, A, Tanga, A A, Zografopoulos, D C, Messina, G C, Ortolani, M, Beccherelli, R
Format: Article
Language:English
Subjects:
Aluminum
Bandpass filters
Narrowband
Polyolefins
Spectral sensitivity
System effectiveness
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Summary:In this work, we design and experimentally demonstrate a novel terahertz (THz) filter exhibiting a flattened spectral response in the atmospheric transmission window around the central frequency of 300 GHz. The innovative concept behind this filter is the coupling of Fabry-Perot and guided mode resonances. The latter arise from a two-dimensional patch array patterned on an aluminum layer deposited on a low loss cyclo-olefin polymer. The filter experimental performance shows high transmittance in the flat-top band, with less than 3 dB losses, and high out-of-band rejection, as theoretically expected. This kind of component provides a cost-effective, functional solution for narrowband filtering in emerging THz devices and systems with possible applications in wireless telecommunications.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.44.004239