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42 SMT Magazine • December 2017 of center for easier access, a better visual in pro- cess, and less ambiguous installation. We like to put both images of a double-sided board on the same stencil to reduce change over time. The distance between the two images needs to match your printer's blade span and over travel distance. Editing your own data also allows you to eliminate the check plot, further reducing your design cycle time. It also reduces the fabricator's editing time, further improving their turn time. Rather than spending time generating a document to describe the edits to your stencil fabricator and hoping they'll get it right, make the edits yourself to get what you intended and improve your process. SMT Ken Horky is a process engineer at Peterson Manufacturing. He may be reached at TIPS & TRICKS: GENERATING STENCIL TOOLING Figure 1: Home plate design. A flexible detector for terahertz frequencies has been developed by Chalmers University of Tech- nology researchers Xinxin Yang, Andrei Vorobiev, Andrey Generalov, Michael A. Andersson and Jan Stake, using graphene transistors on plastic sub- strates. It is the first of its kind, and can extend the use of terahertz technology to applications that will require flexible electronics, such as wireless sensor networks and wearable technology. The detector has unique features. At room tem- perature, it detects signals in the frequency range 330 to 500 gigahertz. It is translucent and flexible, and opens to a variety of applications. The tech- nique can be used for imaging in the terahertz area (THz camera), but also for identifying different sub- stances. It may also be of potential benefit in health care, where terahertz waves can be used to detect cancer. Other areas where the detector could be used are imaging sensors for vehicles or for wireless communications. The unique electronic features of graphene, combined with its flexible nature, make it a promising material to integrate into plastic and fabric, something that will be important building blocks in a future interconnected world. The research on the terahertz detector has been funded by the EU Graphene Flagship, the Swedish Foundation for Strategic Research (SSF), and the Knut and Alice Wallenberg Foundation (KAW). Graphene Enables High-Speed Electronics on Flexible Materials

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