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. 2020 Sep 25;11:4872. doi: 10.1038/s41467-020-18544-z

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Schematic representation of the photodetector consisting of H-shaped resonant gates of 4.2 μm of total length, with a hBN-encapsulated H-shaped graphene channel transferred on top, contacted by source and drain electrodes. A bow-tie antenna of 2.7 μm of total length is placed on top of the 2D stack. The local gates serve to create a pn-junction in the central part of the graphene channel (by applying voltages V_L and V_R), where the antenna gap and gate gap are located. Both narrow gaps are on the order of ~100 nm. The scale bar corresponds to 0.5 μm. b Side view of the device design (not to scale) with indications of the materials' thicknesses. c Optical image of the photodetector. The dashed lined circle indicates the typical beam spot size obtained at λ = 6.6 μm. The scale bar corresponds to 2.5 μm. d Cross section view of the simulated total electric field intensity (∣E∣²) normalized to the incident one (∣E₀∣²) along the antenna main axis when light is polarized parallel to the bow-tie antenna (TM-polarization) axis as indicated in the illustration on the left. The white scale bar corresponds to 250 nm. e Same as (d) but for light polarization perpendicular to the bow-tie antenna (TE-polarization) and parallel to the local gates as shown in the schematic on the left.