| ATOMIC AND MOLECULAR PHYSICS |
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Enhanced THz Radiation from Spatially Inhomogeneous Fields |
| Guang-Rui Jia1,2, Deng-Xin Zhao1,3, Song-Song Zhang2, Zi-Wei Yue2, Chao-Chao Qin1, Zhao-Yong Jiao1, and Xue-Bin Bian1,3* |
1School of Physics, Henan Normal University, Xinxiang 453007, China
2School of Materials Science and Engneering, Henan Normal University, Xinxiang 453007, China
3Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
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| Cite this article: |
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Guang-Rui Jia, Deng-Xin Zhao, Song-Song Zhang et al 2023 Chin. Phys. Lett. 40 103202 |
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Abstract Nonlinear terahertz (THz) radiation from gas media usually relies on the asymmetric laser-induced current produced by ultra-intense two-color laser fields with a specific phase delay. Here a new scheme is proposed and theoretically investigated, in which the radiation is generated by spatially inhomogeneous fields induced by relatively low-intensity monochromatic lasers and an array of single triangular metallic nanostructures. Our simulations are based on the classical photocurrent model and the time-dependent Schrödinger equations separately. It is found that the collective motion of the ionized electrons can be efficiently controlled by the inhomogeneous field, resulting in strong residual currents. The intensity of the THz radiation could be enhanced by about two orders of magnitude by increasing the spatial inhomogeneity of the field.
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Received: 22 July 2023
Published: 26 September 2023
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| PACS: |
33.20.Xx
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(Spectra induced by strong-field or attosecond laser irradiation)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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32.80.Qk
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(Coherent control of atomic interactions with photons)
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31.70.Hq
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(Time-dependent phenomena: excitation and relaxation processes, and reaction rates)
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