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Broadband ultra-low-loss mesh filters on flexible cyclic olefin copolymer films for terahertz applications
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Image of FIG. 1.
FIG. 1.

SEM image of a single-layer filter before Si wafer removal. The lattice homogeneity (period of 38 μm) is well-maintained over the whole mesh surface. Inset: close-up of a mesh-cross, squares have been added to improve the adhesion and stability of the mesh wires (width of 500 nm) without influencing the EM response.

Image of FIG. 2.
FIG. 2.

Unit cells of the mesh-filters used for the simulations. Figs. 2(a) and 2(b) show the structures of the single-layer and double-layer filters, respectively. The structures are in scale and their dimensions are reported in Table I .

Image of FIG. 3.
FIG. 3.

Photograph of the single-layer filter mounted onto an annular holder. COC high transparency and sub-μm mesh wires width make the filter hardly visible.

Image of FIG. 4.
FIG. 4.

Transmission properties of the mesh filters. Insets are in linear scale. Fig. 4(a) shows the comparison between two single-layer filters with different width w and same period d = 38 μm. The inset reveals a higher transmittance above 1.5 THz for the filter with w = 0.5 μm. Fig. 4(b) shows that multi-layer filters are able to increase the rejection ratio in the stop-band while keeping a high transmittance above 1.5 THz. The red curve (up triangle) and the black curve (dashed) have been reported as a reference and correspond to the same curves of Fig. 4(a) . The inset emphasizes the role of Fabry-Pérot fringes in the pass-band.


Generic image for table
Table I.

Parameters used in the design of the single-layer, the double-layer, and the triple-layer (only simulated) filters with at 1 THz (units are μm).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Broadband ultra-low-loss mesh filters on flexible cyclic olefin copolymer films for terahertz applications