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Multi-pixel photoconductive emitters for the controllable generation of azimuthal and radial terahertz beams
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Deveikis, Justas and Lloyd-Hughes, James (2022) Multi-pixel photoconductive emitters for the controllable generation of azimuthal and radial terahertz beams. Optics Express, 30 (24). pp. 43293-43300. doi:10.1364/OE.473086 ISSN 1094-4087.
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Official URL: http://dx.doi.org/10.1364/OE.473086
Abstract
A multi-pixel photoconductive emitter is reported that generates THz beams with either azimuthal, radial or linear polarization states. Switching between the different polarization states was purely electrical, via the bias voltage applied, circumventing the need for mechanical polarization optics or different THz emitters to change the polarization. Dipole array modelling was performed to validate emitter array designs, and to explore their optimal bias configuration, while spatially-resolved electro-optic detection of the generated beams confirmed that cylindrical-vector beams were produced. We further demonstrate that the spatial beam profile was optimized by adjusting the bias level on particular pixels, improving the polarization purity of the beam.
| Item Type: | Journal Article | ||||||
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| Subjects: | Q Science > QC Physics | ||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Terahertz spectroscopy, Polarization (Light), Photoconductivity , Optics | ||||||
| Journal or Publication Title: | Optics Express | ||||||
| Publisher: | Optical Society of America | ||||||
| ISSN: | 1094-4087 | ||||||
| Official Date: | 9 November 2022 | ||||||
| Dates: |
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| Volume: | 30 | ||||||
| Number: | 24 | ||||||
| Page Range: | pp. 43293-43300 | ||||||
| DOI: | 10.1364/OE.473086 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Date of first compliant deposit: | 8 December 2022 | ||||||
| Date of first compliant Open Access: | 8 December 2022 | ||||||
| RIOXX Funder/Project Grant: |
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