Polarization modulation of terahertz electromagnetic radiation by four-contact photoconductive antenna
Open accessAbstract
Generation and modulation of circularly polarized terahertz electromagnetic radiation have been demonstrated by using a four-contact photoconductive antenna and a total-reflection Si prism. The quality of the circularly polarized terahertz pulsed radiation has been evaluated by using a polarization sensitive terahertz time-domain spectroscopy system. The characteristic of the dynamic modulation between the left and right circularly polarized states of the THz radiation is also evaluated. The ellipticity of the modulated circularly polarized THz radiation without a polarizer is not as good as that of the non-modulated because of the non-uniform bias field distribution and the asymmetric pump laser intensity profile on the photoconductive gap.
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It has been difficult to directly generate broadband circularly polarized THz radiation; efforts to develop a THz circular polarizer or linear-to-circular polarization converter suffer from limited bandwidth up to one octave or from being bulky and difficult to deploy.
“It has been notoriously difficult to directly generate broadband circularly polarized THz radiation. Efforts have been ongoing to develop a THz circular polarizer or linear-to-circular polarization converter, but suffer either from limited bandwidth up to one octave210,211 (still much narrower than the bandwidth of typical THz pulses) or being bulky and difficult to deploy212.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [212]
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References 8 · Cited by 76
- Authors
- Hirota, Y., Hattori, R., Tani, M., & Hangyo, M.
- Affiliations
- Institute of Laser Engineering, The University of Osaka (JP)
- Mitsubishi Electric (Japan) (JP)
- Venue
- Optics Express
- Publisher
- Optica Publishing Group
- Published
- 2006
- Volume
- 14
- Issue
- 10
- Pages
- 4486
- ISSN
- 1094-4087 (ISSN-L)
- OpenAlex
- W1967937191
- Cited by
- 76
- References
- 8
- Citations by year
- 2026: 3 · 2025: 1 · 2024: 5 · 2023: 5 · 2022: 3 · 2021: 4 · 2020: 3 · 2019: 8 · 2018: 1 · 2017: 3 · 2016: 5 · 2015: 5 · 2014: 7 · 2013: 3 · 2012: 4
- FWCI
- 3.71
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Optics Express (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Japan Society for the Promotion of Science
- 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 › Physics and Astronomy › Astronomy and Astrophysics › Superconducting and THz Device Technology
- Keywords
- terahertz radiation, polarization modulation, circular polarization, photoconductive antenna, ellipticity
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