Mechanisms of THz generation from silver nanoparticle and nanohole arrays illuminated by 100 fs pulses of infrared light
Abstract
We study THz pulses generated from plasmonic metal nanostructures under femtosecond illumination of near-IR light. We find two regimes of excitation, according to the order of the dependence of the THz fluence on the incident near-IR intensity: less then second order at low intensities, changing to approximately fourth order for higher intensities. These regimes are most likely associated with two THz generation mechanisms: optical rectification, and the ponderomotive acceleration of ejected electrons. These data provide evidence that both mechanisms can be at work in the same experiment.
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In Polyushkin et al. photoemission data, a transition is observed for input intensities around 30 GW cm−2 corresponding to a transitional Keldysh parameter of 1.5, estimating a 20-fold plasmonic field enhancement and peak near-field intensity of about 10^13 W cm−2.
“In the photoemission data of Polyushkin et al.159, a transition is indeed observed for input intensities around 30 GW cm−2 corresponding to a transitional 1.5, estimating a 20 plasmonic field enhancement (peak near-field intensity ~1013 W⋅cm-2).”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [159]
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Experimental — accuracy not yet measuredIn Polyushkin et al., low-order THz emission fluence dependence consistent with optical rectification was demonstrated at lower incident fluences, transitioning to higher-order behavior at intermediate fluences, followed by leveling off to apparent low-order behavior at the highest fluences.
“A low-order THz emission fluence dependence (consistent with optical rectification) was demonstrated at lower incident fluences, transitioning to higher-order ( 4) behavior at intermediate fluences, followed by a leveling off to apparent low-order behavior again at the highest fluences (Fig. 8b).”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [159]
The relative roles of optical rectification and multiphoton photoemission in nanostructure arrays were clarified by Polyushkin et al. in combined THz emission and photoelectron emission studies.
“the relative roles of optical rectification and multiphoton photoemission were only clarified by Polyushkin et al. 159 in combined THz emission and photoelectron emission studies of nanostructure arrays.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [159]
Nanoscale structuring of metal films enhances THz emission.
“subsequent investigations found enhanced THz emission due to nanoscale structuring, including with gratings175–177, randomly-distributed nanostructuring178–182, and precision lithographically-defined nanostructure arrays159,178 (Fig. 8a).”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [159]
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References 34 · Cited by 56
- Authors
- Polyushkin, D. K., Márton, I., Rácz, P., Dombi, P., Hendry, E., & Barnes, W. L.
- Affiliations
- TU Wien (AT)
- HUN-REN Wigner Research Centre for Physics (HU)
- Max Planck Institute of Quantum Optics (DE)
- University of Exeter (GB)
- Corresponding author
- Polyushkin, D. K.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2014-03-24
- Volume
- 89
- Issue
- 12
- ISSN
- 1098-0121 (ISSN-L)
- 1550-235X
- OpenAlex
- W1995037798
- Cited by
- 56
- References
- 34
- Citations by year
- 2025: 3 · 2024: 5 · 2023: 8 · 2022: 5 · 2021: 1 · 2020: 4 · 2019: 5 · 2018: 3 · 2017: 3 · 2016: 9 · 2015: 9 · 2014: 1
- FWCI
- 3.89
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical Review B (publishedVersion)
- University of Twente Research Information (publishedVersion)
- Repository of the Academy's Library (Library of the Hungarian Academy of Sciences) (acceptedVersion)
- Max Planck Digital Library (submittedVersion)
- Figshare (submittedVersion)
- Open Research Exeter (University of Exeter) (submittedVersion)
- MPG.PuRe (Max Planck Society) (submittedVersion)
- University of Twente Research Information (submittedVersion)
- Funders
- Hungarian Scientific Research Fund (109257, 81364)
- Magyar Tudományos Akadémia
- Engineering and Physical Sciences Research Council (EP/F026757/1, EP/K041215/1)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Physical Sciences › Engineering › Biomedical Engineering › Plasmonic and Surface Plasmon Research
- Keywords
- terahertz generation, silver nanoparticle arrays, nanohole arrays, plasmonic nanostructures, optical rectification, ponderomotive acceleration, electron ejection, nonlinear response
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