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

Ferraro, Antonio; Tanga, A.; Zografopoulos, Dimitrios C.; Messina, Gabriele C.; Ortolani, Michele; Beccherelli, Romeo

doi:10.1364/ol.44.004239

Cited by 15 publications

(9 citation statements)

References 22 publications

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“…The ratio of the original frequency to the unwanted frequencies in the output spectral range of the filter is the main advantage of the structure of this filter [31][32][33].…”

Section: Analysis Of Noise (Unwanted Frequency)mentioning

confidence: 99%

Design and simulation of a new narrow terahertz bandpass filter

Shahounvand

Fard

2020

SN Appl. Sci.

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“…The ratio of the original frequency to the unwanted frequencies in the output spectral range of the filter is the main advantage of the structure of this filter [31][32][33].…”

Section: Analysis Of Noise (Unwanted Frequency)mentioning

confidence: 99%

Design and simulation of a new narrow terahertz bandpass filter

Shahounvand

Fard

2020

SN Appl. Sci.

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“…A combination of Fabry-Perot and guided mode resonances provides creating flat-top filter with less than 3 dB losses at central frequency 300 GHz, a 5 GHz flat-top, 19 GHz bandwidth at −15dB, that means high out-of-band rejection [20].…”

Section: Frequency-selective Surfacesmentioning

confidence: 99%

Arrays of Sub-Terahertz Cryogenic Metamaterial

et al. 2021

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Integrated quasi-optical cryogenic terahertz receivers contain arrays of detectors, quasi-optical filters, interferometers, and other metamaterials. Matrices of quasi-optical band-pass, low-pass, and high-pass filters, Fabry–Perot grid interferometers, and arrays of half-wave and electrically small antennas with superconductor-insulator-normal metal-insulator-superconductor (SINIS) sub-terahertz wavelength range detectors were fabricated and experimentally studied on the same computational, technological, and experimental platform. For the design of the filters, we used the periodic frequency-selective surfaces (FSS) approach, contrary to detector arrays that can be presented in a model of distributed absorbers. The structures were fabricated using direct electron beam lithography, thermal shadow evaporation, lift-off, alternatively magnetron sputtering, and chemical and plasma etching. The numerical simulation methods of such structures are sufficiently different: for the reactive matrices with low losses, the approximation of an infinite structure with periodic boundary conditions is applicable, and for the arrays of detectors with dissipative elements of absorbers, a complete analysis of the finite structure with hundreds of interacting ports is applicable. The difference is determined by the presence of dissipation in the detector arrays, the phase of the reflected or re-emitted signal turned out to be undefined and the Floquet periodic boundary conditions are correct only for a phased array antenna. The spectral characteristics of the created filters, interferometers, and antenna arrays were measured in the frequency range 50–600 GHz.

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“…Kawanishi et al also reported cross-stacked guided-mode resonant gratings, which resulted in a narrow-band flat-top spectrum with a full width at half maximum (FWHM) of 7 nm [12]. Recently, Ferraro et al demonstrated a novel flat-top filter for terahertz telecom applications based on cascading two identical RWGs [13].…”

Section: Introductionmentioning

confidence: 99%

Tunable Flat-Top Filtering Response in Cascaded Resonant Waveguide Gratings

Liu

et al. 2021

IEEE Photonics J.

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The applicability of resonant waveguide grating (RWG)-based structures as filters to control the spectral response in an optical communication system is investigated. A new physical model for the structure is established on the basis of the Fabry-Pérot (FP) etalon model and coupled leaky mode theory (CLMT). It is found that the flat-top spectral response of the filter is achieved by the combined effect of the guided-mode resonance of an RWG and its Fabry-Pérot resonance (FPR). The bandwidth-tunable spectral response of the filter can be varied according to the change in the eigenvalues of the RWG by changing the structural parameters such as strip width of the grating and incident angle. The flat-top and bandwidth-tunable RWG-based resonant filter is a promising application for high-performance optical communication systems.

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

Cited by 15 publications

References 22 publications

Design and simulation of a new narrow terahertz bandpass filter

Design and simulation of a new narrow terahertz bandpass filter

Arrays of Sub-Terahertz Cryogenic Metamaterial

Tunable Flat-Top Filtering Response in Cascaded Resonant Waveguide Gratings

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