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  • 1.
    Gomez-Torrent, Adrian
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Micro and Nanosystems.
    García-Vigueras, María
    Institut National des Sciences Appliquées de Rennes: Rennes, Bretagne, FR.
    Le Coq, Laurent
    Université de Rennes 1: Rennes, Bretagne, FR.
    Mahmoud, Adham
    Ettorre, Mauro
    CNRS Délégation Bretagne et Pays de Loire: Rennes, Bretagne, FR.
    Sauleau, Ronan
    Université de Rennes 1: Rennes, FR.
    Oberhammer, Joachim
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Micro and Nanosystems.
    A Low-Profile and High-Gain Frequency Beam Steering Subterahertz Antenna Enabled by Silicon Micromachining2020In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 68, no 2, p. 672-682Article in journal (Refereed)
    Abstract [en]

    A very low-profile sub-THz high-gain frequencybeam steering antenna, enabled by silicon micromachining, is reported for the first time in this paper. The operation bandwidth of the antenna spans from 220 GHz to 300 GHz providing a simulated field of view of 56°. The design is based on a dielectric filled parallel-plate waveguide (PPW) leaky-wave antenna fed by a pillbox. The pillbox, a two-level PPW structure, has an integrated parabolic reflector to generate a planar wave front. The device is enabled by two extreme aspect ratio, 16 mm x16 mm large perforated membranes, which are only 30 μm thick, that provide the coupling between the two PPWs and form the LWA. The micromachined low-loss PPW structure results in a measured average radiation efficiency of −1 dB and a maximum gain of 28.5 dBi with an input reflection coefficient below −10 dB. The overall frequency beam steering frontend is extremely compact (24mm x 24mm x 0.9 mm) and can be directly mounted on a standard WM-864 waveguide flange. The design and fabrication challenges of such high performance antenna in the sub-THz frequency range are described and the measurement results of two fabricated prototypes are reported and discussed.

  • 2.
    Ottonello Briano, Floria
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Micro and Nanosystems.
    Errando-Herranz, Carlos
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Micro and Nanosystems.
    Rödjegård, Henrik
    Martin, Hans
    Sohlström, Hans
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Micro and Nanosystems.
    Gylfason, Kristinn
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Micro and Nanosystems.
    Carbon dioxide absorption spectroscopy with a mid-infrared silicon photonic waveguide2020In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 45, no 1, p. 109-112Article in journal (Refereed)
    Abstract [en]

    Carbon dioxide (CO2) is a gas vital for life on Earth. It is also a waste product of human activities and is widely used in agriculture and industry. Its accurate sensing is therefore of great interest. Optical sensors exploiting the mid-infrared light absorption of CO2 provide high selectivity, but their large size and high cost limit their use. In this Letter, we demonstrate CO2 gas sensing at 4.2 µm wavelength using an integrated silicon waveguide, featuring a sensitivity to CO2 of 44% that of free-space sensing. The suspended waveguide is fabricated on a silicon-on-insulator substrate by a single-lithography-step process, and we route it into a mid-infrared photonic circuit for on-chip-referenced gas measurements. Its demonstrated performance and its simple and scalable fabrication make our waveguide ideal for integration in miniaturized CO2 sensors for distributed environmental monitoring, personal safety, and medical and high-volume consumer applications.

  • 3. Shi, Xinying
    et al.
    Huang, Zhongjia
    Laakso, Miku
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Micro and Nanosystems.
    Niklaus, Frank
    Sliz, Rafal
    Fabritius, Tapio
    Somani, Mahesh
    Nyo, Tun
    Wang, Xiao
    Zhang, Meng
    Wang, Gang
    Kömi, Jukka
    Huttula, Marko
    Cao, Wei
    Corrigendum to "Quantitative assessment of structural and compositional colors induced by femtosecond laser: A case study on 301LN stainless steel surface" [Appl. Surf. Sci. 484 (2019) 655-662]2020In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 504, article id 144583Article in journal (Other academic)
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