Terahertz flip-mode via 3D printed π-step phase plate

Authors

  • Kenneth Jay Alaba National Institute of Physics, University of the Philippines Diliman
  • Ivan Cedrick Verona National Institute of Physics, University of the Philippines Diliman
  • Kristiene Joy Fernandez Materials Science and Engineering Program, University of the Philippines Diliman
  • Jose Mari Sebastian Arcilla National Institute of Physics, University of the Philippines Diliman
  • Lourdes Nicole Dela Rosa National Institute of Physics, University of the Philippines Diliman
  • Hannah R. Bardolaza National Institute of Physics, University of the Philippines Diliman
  • Rayko Ivanov Stantchev Department of Physics, National Sun Yat-sen University
  • Nathaniel P. Hermosa II National Institute of Physics, University of the Philippines Diliman
  • Elmer S. Estacio National Institute of Physics, University of the Philippines Diliman

Abstract

A π-step phase plate was designed to operate at a peak frequency of a terahertz photoconductive antenna (PCA) emitter at around 0.1 THz and was used to generate a structured terahertz (THz) beam. The phase plate was 3D printed using a thermoplastic polyurethane (PLA) filament and placed between the parabolic mirrors of a standard THz time-domain spectroscopy (THz-TDS) setup. The resulting amplitude and phase distributions of the beam were experimentally measured using a movable slit. Fourier transform techniques were utilized to analyze the amplitude and phase of the frequency components of the beam. At the design frequency, the amplitude profile revealed two distinct peaks separated by a region of low intensity, while the phase distribution exhibited a sharp phase shift coinciding with the location of the amplitude dip. These observations confirm the effectiveness of the phase plate in modulating the beam structure at the target frequency.

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Published

2025-06-19

Issue

2025: Proceedings of the 43rd Samahang Pisika ng Pilipinas Physics Conference

Section

Poster Session PA (Photonics, Condensed Matter, Materials and Quantum Science)

License

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All other associated economic and moral rights as granted by the Intellectual Property Code of the Philippines are maintained by the Authors.

How to Cite

[1]
“Terahertz flip-mode via 3D printed Ï€-step phase plate”, Proc. SPP, vol. 43, no. 1, p. SPP-2025-PA-38, Jun. 2025, Accessed: Mar. 31, 2026. [Online]. Available: https://proceedings.spp-online.org/article/view/SPP-2025-PA-38