Maximal terahertz emission in high harmonic generation from 3D Dirac semimetals
Unlike conventional semiconductor platforms, 3D Dirac semimetals (DSMs) require relatively low input laser intensities for efficient terahertz (THz) high harmonic generation (HHG), making them promising materials for developing compact THz light sources. Here, we show that 3D DSMs’ high nonlinearity...
| Main Authors: | , , , |
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| Drugi avtorji: | |
| Format: | Journal Article |
| Jezik: | English |
| Izdano: |
2022
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| Online dostop: | https://hdl.handle.net/10356/154953 |
| _version_ | 1826112178943426560 |
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| author | Lim, Jeremy Ang, Yee Sin Ang, Lay Kee Wong, Liang Jie |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Lim, Jeremy Ang, Yee Sin Ang, Lay Kee Wong, Liang Jie |
| author_sort | Lim, Jeremy |
| collection | NTU |
| description | Unlike conventional semiconductor platforms, 3D Dirac semimetals (DSMs) require relatively low input laser intensities for efficient terahertz (THz) high harmonic generation (HHG), making them promising materials for developing compact THz light sources. Here, we show that 3D DSMs’ high nonlinearity opens up a regime of nonlinear optics where extreme subwavelength current density features develop within nanoscale propagation distances of the driving field. Our results reveal orders-of-magnitude enhancement in HHG intensity with thicker 3D DSM films, and show that these subwavelength features fundamentally limit HHG enhancement beyond an optimal film thickness. This decrease in HHG intensity beyond the optimal thickness constitutes an effective propagation-induced dephasing. Our findings highlight the importance of propagation dynamics in nanofilms of extreme optical nonlinearity. |
| first_indexed | 2024-10-01T03:02:43Z |
| format | Journal Article |
| id | ntu-10356/154953 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:02:43Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1549532022-05-27T01:53:32Z Maximal terahertz emission in high harmonic generation from 3D Dirac semimetals Lim, Jeremy Ang, Yee Sin Ang, Lay Kee Wong, Liang Jie School of Electrical and Electronic Engineering Engineering::Electrical and electronic engineering Electrons Pulses Unlike conventional semiconductor platforms, 3D Dirac semimetals (DSMs) require relatively low input laser intensities for efficient terahertz (THz) high harmonic generation (HHG), making them promising materials for developing compact THz light sources. Here, we show that 3D DSMs’ high nonlinearity opens up a regime of nonlinear optics where extreme subwavelength current density features develop within nanoscale propagation distances of the driving field. Our results reveal orders-of-magnitude enhancement in HHG intensity with thicker 3D DSM films, and show that these subwavelength features fundamentally limit HHG enhancement beyond an optimal film thickness. This decrease in HHG intensity beyond the optimal thickness constitutes an effective propagation-induced dephasing. Our findings highlight the importance of propagation dynamics in nanofilms of extreme optical nonlinearity. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) Nanyang Technological University Published version L.J.W. acknowledges the support of the Agency for Science, Technology, and Research (A*STAR) Advanced Manufacturing and Engineering Young Individual Research Grant (A1984c0043); and the Nanyang Assistant Professorship Start-up Grant. J.L. and L.K.A. acknowledge funding from Singapore MOE Tier 2 Grant (2018-T2-1-007), MOE PhD RSS, and USA ONRG grant (N62909-19-1-2047). Y.S.A. acknowledges funding from SUTD Start-up Research Grant. 2022-05-27T01:53:32Z 2022-05-27T01:53:32Z 2021 Journal Article Lim, J., Ang, Y. S., Ang, L. K. & Wong, L. J. (2021). Maximal terahertz emission in high harmonic generation from 3D Dirac semimetals. Communications Physics, 4(1), 235-. https://dx.doi.org/10.1038/s42005-021-00738-6 2399-3650 https://hdl.handle.net/10356/154953 10.1038/s42005-021-00738-6 2-s2.0-85118538560 1 4 235 en A1984c0043 2018-T2-1-007 Communications Physics © 2021 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/ licenses/by/4.0/. application/pdf |
| spellingShingle | Engineering::Electrical and electronic engineering Electrons Pulses Lim, Jeremy Ang, Yee Sin Ang, Lay Kee Wong, Liang Jie Maximal terahertz emission in high harmonic generation from 3D Dirac semimetals |
| title | Maximal terahertz emission in high harmonic generation from 3D Dirac semimetals |
| title_full | Maximal terahertz emission in high harmonic generation from 3D Dirac semimetals |
| title_fullStr | Maximal terahertz emission in high harmonic generation from 3D Dirac semimetals |
| title_full_unstemmed | Maximal terahertz emission in high harmonic generation from 3D Dirac semimetals |
| title_short | Maximal terahertz emission in high harmonic generation from 3D Dirac semimetals |
| title_sort | maximal terahertz emission in high harmonic generation from 3d dirac semimetals |
| topic | Engineering::Electrical and electronic engineering Electrons Pulses |
| url | https://hdl.handle.net/10356/154953 |
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