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

Authors

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

Issue

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

Article ID

SPP-2025-PA-38

Section

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

Published

2025-06-19

How to Cite

[1]

KJ Alaba, IC Verona, KJ Fernandez, JMS Arcilla, LN Dela Rosa, HR Bardolaza, RI Stantchev, NP Hermosa, and ES Estacio, Terahertz flip-mode via 3D printed π-step phase plate, Proceedings of the Samahang Pisika ng Pilipinas 43, SPP-2025-PA-38 (2025). URL: https://proceedings.spp-online.org/article/view/SPP-2025-PA-38.