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  • 1.
    Fullager, Daniel B.
    et al.
    Univ N Carolina, NC 28223 USA.
    Park, Serang
    Univ N Carolina, NC 28223 USA.
    Hovis, Clark
    Univ N Carolina, NC 28223 USA.
    Li, Yanzeng
    Univ N Carolina, NC 28223 USA.
    Reese, Jesse
    Univ N Carolina, NC 28223 USA.
    Sharma, Erin
    Harris Corp, FL 32905 USA.
    Lee, Susanne
    Harris Corp, FL 32905 USA.
    Evans, Christopher
    Univ N Carolina, NC 28223 USA.
    Boreman, Glenn D.
    Univ N Carolina, NC 28223 USA.
    Hofmann, Tino
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering. Univ N Carolina, NC 28223 USA.
    Metalized Poly-methacrylate Off-Axis Parabolic Mirrors for Terahertz Imaging Fabricated by Additive Manufacturing2019In: Journal of Infrared, Millimeter and Terahertz Waves, ISSN 1866-6892, E-ISSN 1866-6906, Vol. 40, no 3, p. 269-275Article in journal (Refereed)
    Abstract [en]

    Terahertz radiation sources are currently one of the most widely used non-ionizing illumination mechanisms for security applications and also find increasing utilization in quality control of commercial products. Presently, a majority of these applications rely on scanning rather than direct imaging and implicitly suffer from temporal latency due to post processing. The monetary and temporal cost associated with procuring commercially manufactured optics that are suitable for imaging leads to fundamental limitations in the ability to rapidly develop application-specific imaging modalities using terahertz sources. Herein, we show a novel method for the rapid prototyping of metallic coated poly-methacrylate parabolic reflectors fabricated by stereolithographic 3D printing. Images comparing the performance of a commercially available off-axis parabolic reflector to our metalized poly-methacrylate prototype, which was designed to be identical to the commercially available mirror, are subsequently presented. The images show that at 530 GHz it is possible to produce a metalized poly-methacrylate off-axis paraboloid whose spatial beam profile is nearly identical to that of a commercially available equivalent.

  • 2.
    Park, Serang
    et al.
    Univ N Carolina, NC 28223 USA.
    Li, Yanzeng
    Univ N Carolina, NC 28223 USA.
    Fullager, Daniel B.
    Lasertel, AZ 85743 USA.
    Schoche, Stefan
    JA Woollam Co Inc, NE 68508 USA.
    Herzinger, Craig M.
    JA Woollam Co Inc, NE 68508 USA.
    Boreman, Glenn D.
    Univ N Carolina, NC 28223 USA.
    Hofmann, Tino
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering. Univ N Carolina, NC 28223 USA.
    Terahertz to Mid-infrared Dielectric Properties of Polymethacrylates for Stereolithographic Single Layer Assembly2019In: Journal of Infrared, Millimeter and Terahertz Waves, ISSN 1866-6892, E-ISSN 1866-6906, Vol. 40, no 9, p. 971-979Article in journal (Refereed)
    Abstract [en]

    The fabrication of terahertz (THz) optics with arbitrary shapes via polymethacrylate-based stereolithography is very attractive as it may offer a rapid, low-cost avenue towards optimized THz imaging applications. In order to design such THz optical components appropriately, accurate knowledge of the complex dielectric function of the materials used for stereolithographic fabrication is crucial. In this paper, we report on the complex dielectric functions of several polymethacrylates frequently used for stereolithographic fabrication. Spectroscopic ellipsometry data sets from the THz to mid-infrared spectral range were obtained from isotropically cross-linked polymethacrylate samples. The data sets were analyzed using stratified layer optical model calculations with parameterized model dielectric functions. While the infrared spectral range is dominated by a number of strong absorption features with Gaussian profiles, these materials are found to exhibit only weak absorption in the THz frequency range. In conclusion, we find that thin transmissive THz optics can be efficiently fabricated using polymethacrylate-based stereolithographic fabrication.

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