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.

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. Background
4. 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.
5. 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.
6. 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.
7. Method
8. 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
9. 9 Step2: Rapid Fabrication After Aberration Correction Thermocompression Method [Segawa 2019] A method of printing metal leaf on paper by thermocompression bonding.
10. 10 Step2: Rapid Fabrication After Aberration Correction Rapid Fabrication Silver foil is thermocompression-bonded to the paper.
11. 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
12. 12 Step3: Imaging After Aberration Correction Imaging Process Move the sensor to scan a large area.
13. Simulation & Experiment Results
14. 14 Simulation & Experiment Results After Aberration Correction Input Image / Fabricated Hologram / Simulated Result / Captured Result Input Fabricated Simulated Captured
15. Discussion
16. 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.
17. 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.
18. 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.