Print Email Facebook Twitter Chessboard Focal Plane Array for a CMOS-Integrated Terahertz Camera Title Chessboard Focal Plane Array for a CMOS-Integrated Terahertz Camera Author Hoogelander, M. (TU Delft Tera-Hertz Sensing) van Berkel, S.L. (TU Delft Tera-Hertz Sensing; California Institute of Technology) Malotaux, E.S. (TU Delft Electronics; Tusk IC) Alonso Del Pino, M. (TU Delft Tera-Hertz Sensing) Cavallo, D. (TU Delft Tera-Hertz Sensing) Spirito, M. (TU Delft Electronics) Llombart, Nuria (TU Delft Tera-Hertz Sensing) Date 2023 Abstract This article presents the development of a focal plane array (FPA) for terahertz imaging applications with a near diffraction-limited resolution achieved through a very tight sampling of the focal plane. The antenna array is integrated with direct detectors in a 22-nm CMOS technology and operates from 200 to 600 GHz. The tight sampling of the focal plane is realized by using a combination of leaky-wave radiation and a dual-polarized connected array configuration that closely resembles a chessboard. By utilizing both the polarizations in the chessboard design, the number of array elements per unit area is effectively doubled. The geometry of the chessboard array was co-optimized together with that of a silicon elliptical lens to achieve both high aperture efficiency and beam overlap. Measurements in the WR2.2 band of a fabricated demonstrator showed that an aperture efficiency of −4.1 dB was realized at 400 GHz. The average gain roll-off between two diagonally adjacent array elements was measured to be −1.5 dB at 400 GHz. Compared to the reference configuration of an idealized, equivalently sampled hexagonal FPA, the improvement in gain at the edge of coverage yields 1.2 dB, which includes 1.9 dB of ohmic losses in the chessboard array. The agreement between measurements and simulations proved to be within 1 dB from 325 to 475 GHz. Subject Antenna arraysAperturesCamerasCMOS antenna arraydirect-detectorFeedsfocal plane arrayhigh-resolution imagingImagingleaky-wave antennaslens antenna arrayLensespassive imagingSiliconterahertzultra-wideband To reference this document use: http://resolver.tudelft.nl/uuid:1b6988e7-b883-495d-be96-9cbfeefe0ce2 DOI https://doi.org/10.1109/TTHZ.2023.3297072 Embargo date 2024-05-03 ISSN 2156-342X Source IEEE Transactions on Terahertz Science and Technology, 13 (6), 704-717 Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2023 M. Hoogelander, S.L. van Berkel, E.S. Malotaux, M. Alonso Del Pino, D. Cavallo, M. Spirito, Nuria Llombart Files PDF Chessboard_Focal_Plane_Ar ... Camera.pdf 4.5 MB Close viewer /islandora/object/uuid:1b6988e7-b883-495d-be96-9cbfeefe0ce2/datastream/OBJ/view