Highly efficient terahertz generation using 3D Dirac semimetals

It is shown that three-dimensional Dirac semimetals are promising candidates for highly efficient optical-to-terahertz conversion due to their extreme optical nonlinearities. In particular, it is predicted that the conversion efficiency of (Formula presented.) exceeds typical materials like (Formula...

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Main Authors: Wang, Lu, Lim, Jeremy, Wong, Liang Jie
Other Authors: School of Electrical and Electronic Engineering
Format: Journal Article
Language:English
Published: 2023
Subjects:
Online Access:https://hdl.handle.net/10356/170539
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author Wang, Lu
Lim, Jeremy
Wong, Liang Jie
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Wang, Lu
Lim, Jeremy
Wong, Liang Jie
author_sort Wang, Lu
collection NTU
description It is shown that three-dimensional Dirac semimetals are promising candidates for highly efficient optical-to-terahertz conversion due to their extreme optical nonlinearities. In particular, it is predicted that the conversion efficiency of (Formula presented.) exceeds typical materials like (Formula presented.) by >5000 times over nanoscale propagation distances. Studies show that even when no restrictions are placed on propagation distance, (Formula presented.) still outperforms (Formula presented.) in efficiency by >10 times. The results indicate that by tuning the Fermi energy, Pauli blocking can be leveraged to realize a step-like efficiency increase in the optical-to-terahertz conversion process. It is found that large optical-to-terahertz conversion efficiencies persists over a wide range of input frequencies, input field strengths, Fermi energies, and temperatures. These results could pave the way to the development of ultrathin-film terahertz sources for compact terahertz technologies.
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spelling ntu-10356/1705392023-09-19T02:07:11Z Highly efficient terahertz generation using 3D Dirac semimetals Wang, Lu Lim, Jeremy Wong, Liang Jie School of Electrical and Electronic Engineering Engineering::Electrical and electronic engineering Dirac Semimetals Nonlinear Optics It is shown that three-dimensional Dirac semimetals are promising candidates for highly efficient optical-to-terahertz conversion due to their extreme optical nonlinearities. In particular, it is predicted that the conversion efficiency of (Formula presented.) exceeds typical materials like (Formula presented.) by >5000 times over nanoscale propagation distances. Studies show that even when no restrictions are placed on propagation distance, (Formula presented.) still outperforms (Formula presented.) in efficiency by >10 times. The results indicate that by tuning the Fermi energy, Pauli blocking can be leveraged to realize a step-like efficiency increase in the optical-to-terahertz conversion process. It is found that large optical-to-terahertz conversion efficiencies persists over a wide range of input frequencies, input field strengths, Fermi energies, and temperatures. These results could pave the way to the development of ultrathin-film terahertz sources for compact terahertz technologies. Agency for Science, Technology and Research (A*STAR) Nanyang Technological University L.J.W. acknowledges the support of the Agency for Science, Technology and Research (A*STAR) Science & Engineering Research Council (Grant No. A1984c0043), and the Nanyang Assistant Professorship Start-up Grant. 2023-09-19T02:07:11Z 2023-09-19T02:07:11Z 2022 Journal Article Wang, L., Lim, J. & Wong, L. J. (2022). Highly efficient terahertz generation using 3D Dirac semimetals. Laser and Photonics Reviews, 16(10), 2100279-. https://dx.doi.org/10.1002/lpor.202100279 1863-8880 https://hdl.handle.net/10356/170539 10.1002/lpor.202100279 2-s2.0-85135046196 10 16 2100279 en A1984c0043 Laser and Photonics Reviews © 2022 Wiley-VCH GmbH. All rights reserved.
spellingShingle Engineering::Electrical and electronic engineering
Dirac Semimetals
Nonlinear Optics
Wang, Lu
Lim, Jeremy
Wong, Liang Jie
Highly efficient terahertz generation using 3D Dirac semimetals
title Highly efficient terahertz generation using 3D Dirac semimetals
title_full Highly efficient terahertz generation using 3D Dirac semimetals
title_fullStr Highly efficient terahertz generation using 3D Dirac semimetals
title_full_unstemmed Highly efficient terahertz generation using 3D Dirac semimetals
title_short Highly efficient terahertz generation using 3D Dirac semimetals
title_sort highly efficient terahertz generation using 3d dirac semimetals
topic Engineering::Electrical and electronic engineering
Dirac Semimetals
Nonlinear Optics
url https://hdl.handle.net/10356/170539
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