Percolation-enhanced generation of terahertz pulses by optical rectification on ultrathin gold films
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Emission of pulses of electromagnetic radiation in the terahertz range is observed when ultrathin gold films on glass are illuminated with femtosecond near-IR laser pulses. A distinct maximum is observed in the emitted terahertz amplitude from films of average thickness just above the percolation threshold. Our measurements suggest that the emission is through a second-order nonlinear optical rectification process, enhanced by the excitation of localized surface plasmon hot spots on the percolated metal film.
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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 [179]
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References 18 · Cited by 73
Research works printed but not linked: 17
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- Authors
- Ramakrishnan, G., & Planken, P. C. M.
- Affiliations
- Delft University of Technology (NL)
- ORCID
- Planken, Paul C. M.
- Venue
- Optics Letters
- Publisher
- Optica Publishing Group
- Published
- 2011-07-01
- Volume
- 36
- Issue
- 13
- Pages
- 2572
- ISSN
- 0146-9592 (ISSN-L)
- 1539-4794
- OpenAlex
- W2127593185
- Cited by
- 73
- References
- 18
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 1 · 2023: 6 · 2022: 4 · 2021: 4 · 2020: 6 · 2019: 6 · 2018: 3 · 2017: 2 · 2016: 7 · 2015: 11 · 2014: 8 · 2013: 3 · 2012: 6
- FWCI
- 4.26
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Optics Letters (publishedVersion)
- PubMed (publishedVersion)
- Research Repository (Delft University of Technology) (submittedVersion)
- Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
- Funders
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
- Stichting voor Technische Wetenschappen
- 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 pulse generation, optical rectification, percolation threshold, ultrathin gold films, localized surface plasmons, second-order nonlinear optics, femtosecond laser excitation
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