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TeraFoils: Design and Rapid Fabrication Techniques for Binary Holographic Structures in the Terahertz Region - SIGGRAPH 2021 Poster

TeraFoils: Design and Rapid Fabrication Techniques for Binary Holographic Structures in the Terahertz Region - SIGGRAPH 2021 Poster

This presentation was created for the poster session at the SIGGRAPH 2021.
https://s2021.siggraph.org/

【Publication】
Kenta Yamamoto, Kosaku Namikawa, and Yoichi Ochiai. 2021. TeraFoils: Design and Rapid Fabrication Techniques for Binary Holographic Structures in the Terahertz Region. In ACM SIGGRAPH 2021 Poster (SIGGRAPH ’21). ACM, New York, NY, USA, Article 3, 2 pages. DOI: https://doi.org/10.1145/3450618.3469157 (to appear)
https://digitalnature.slis.tsukuba.ac.jp/2021/07/terafoils-publication/

【Project page】
https://digitalnature.slis.tsukuba.ac.jp/2021/07/terafoils/

【Project movie】
(coming soon)

【Presenter】
Kenta Yamamoto (山本健太)
University of Tsukuba
Graduate School of Comprehensive Human Science
Digital Nature Group (Yoichi Ochiai)

【Abstract】
In this paper, we introduce TeraFoils, a method for designing and fabricating material-based structures using binary holograms in the terahertz region. We outline the design, fabrication, imaging, and data processing steps for embedding information inside physical objects and exploring a method to create holographic structures with silver-foiled paper. This paper is a sheet on which silver foil is pasted where the ink is printed, using a home-use laser printer and an electric iron. Wave propagation calculations were performed to design a binary-amplitude hologram. Along with the designed pattern, we fabricated silver-foiled binary holograms in the subterahertz range (0.1 THz) and confirmed their functions using a two-dimensional THz sensor.

Digital Nature Group

July 28, 2021
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Transcript

  1. TeraFoils: Design and Rapid Fabrication Techniques for Binary Holographic Structures

    in the Terahertz Region Kenta Yamamoto1, Kosaku Namikawa1, Yoichi Ochiai1,2 1University of Tsukuba, Digital Nature Group 2Pixie Dust Technologies, Inc.
  2. 2 Overview of TeraFoils Hologram Calculation After Aberration Correction Rapid

    Fabrication Imaging We introduce TeraFoils, a method for designing and fabricating material-based structures using binary holograms in the terahertz region.
  3. 4 Background PoS System [Willis 2013] After Aberration Correction Communication

    [Federici 2010] Foreign Substance Inspection [Lee 2012] In the terahertz range, various applications have been proposed. Due to the property of transmitting various materials like radio waves and having coherence like light waves.
  4. 5 Background 3D Print [Furlan 2016] After Aberration Correction Paper

    [Siemion 2012] Natural Stone [Han 2013] Caramelized Sucrose [Sterczewski 2016] Liquid Crystal [Ji 2017] Holograms in the terahertz region made of various materials.
  5. 6 Background Paper and Silver Foil After Aberration Correction A

    method for generating holograms in the terahertz region that can be rapid-fabricated using paper and silver foil.
  6. 8 Step1: Hologram Computation 1. Backward Propagation 
 (calculate amplitude

    hologram) 2. Binarization 
 (determine hologram pattern) 3. Forward Propagation 
 (simulate reconstructed image) Fresnel Diffraction Equation Binarization Equation
  7. 9 Step2: Rapid Fabrication After Aberration Correction Thermocompression Method [Segawa

    2019] A method of printing metal leaf on paper by thermocompression bonding.
  8. 11 After Aberration Correction Optical Setup for Imaging Optical system.

    A 2D image sensor for terahertz waves was attached to the XZ stage. 2D Sensor (32x32) XZ Stage Hologram Light Source Step3: Imaging
  9. 14 Simulation & Experiment Results After Aberration Correction Input Image

    / Fabricated Hologram / Simulated Result / Captured Result Input Fabricated Simulated Captured
  10. 16 Discussion After Aberration Correction Input Fabricated Simulated Captured Input

    Fabricated Simulated ed 1. Low Quality Hologram Our bainarization process is too simple. A better algorithm should be adopted. Low Quality Hologram Binary Hologram Optimization [Yamamoto 2021] Yamamoto et al. "Gradient-based Optimization ofTime-Multiplexed Binary Computer-GeneratedHolograms by Digital Mirror Device." 2021.
  11. 17 Discussion 2. Noise in Imaging The result measured by

    used sensor was noisy. It is necessary to adjust a light source and a sensor. Our Imaging System Another System [Liao 2020] Noisy Imaging Result Liao et al. "All-optical diffractive neural networked terahertz hologram." 2020.
  12. TeraFoils: Design and Rapid Fabrication Techniques for Binary Holographic Structures

    in the Terahertz Region Kenta Yamamoto1, Kosaku Namikawa1, Yoichi Ochiai1,2 1University of Tsukuba, Digital Nature Group 2Pixie Dust Technologies, Inc.