Multi-pixel photoconductive emitters for the controllable generation of azimuthal and radial terahertz beams

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 o...

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Veröffentlicht in:Optics express 2022-11, Vol.30 (24), p.43293-43300
Hauptverfasser: Deveikis, Justas, Lloyd-Hughes, James
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.473086