Finite-difference time-domain simulation of THz light pulse with orbital angular momentum produced using a spiral phase plate

Kenneth Jay Alaba; Hannah Bardolaza; Nathaniel Hermosa; Elmer Estacio

doi:10.15625/0868-3166/20935

Forthcoming

Finite-difference time-domain simulation of THz light pulse with orbital angular momentum produced using a spiral phase plate

Kenneth Jay Alaba, Hannah R. Bardolaza, Nathaniel P. Hermosa, II, Elmer S. Estacio

Author affiliations

Authors

Kenneth Jay Alaba National Institute of Physics, University of the Philippines Diliman https://orcid.org/0009-0001-7004-811X
Hannah R. Bardolaza National Institute of Physics, University of the Philippines Diliman https://orcid.org/0000-0001-9095-6847
Nathaniel P. Hermosa, II National Institute of Physics, University of the Philippines Diliman https://orcid.org/0000-0001-6067-1170
Elmer S. Estacio National Institute of Physics, University of the Philippines Diliman https://orcid.org/0000-0002-4938-571X

DOI:

https://doi.org/10.15625/0868-3166/20935

Keywords:

orbital angular momentum, spiral phase plate, terahertz, vortex

Abstract

A silicon spiral phase plate (SPP) was proposed for a pulsed terahertz signal to produce orbital angular momentum with a topological charge of $l=1$. The resulting field distribution after the signal passes through the SPP was simulated using finite-difference time-domain method and observed at different propagation distances. It shows that the helical spatial structure and optical vortex were best observed at the farthest distance of 7.5 cm. Additionally, the cross-section field distribution at different times as the signal passes through the SPP indicates a helical wavefront structure. Moreover, the output of a source with different central frequencies was observed when using the same SPP and showed a hollow distribution indicating a vortex despite not being located in the center.

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Published

29-10-2024

How to Cite

[1]

K. J. Alaba, H. Bardolaza, N. Hermosa, and E. Estacio, “Finite-difference time-domain simulation of THz light pulse with orbital angular momentum produced using a spiral phase plate”, Comm. Phys., vol. 34, no. 4, Oct. 2024.

IEEE

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Vol. 34 No. 4 (2024): Forthcoming

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Papers

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