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15 March 2023 Generation of intense terahertz pulses with variable elliptical polarization
Xavier Ropagnol, François Blanchard, Tsuneyuki Ozaki
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Proceedings Volume 12419, Ultrafast Phenomena and Nanophotonics XXVII; 1241902 (2023) https://doi.org/10.1117/12.2651468
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
Using a ZnSe large aperture photoconductive antenna with a specific electrode structure, we demonstrate the generation of intense, sub-cycle terahertz (THz) pulses with variable elliptical polarization and peak fields above 80 kV/cm. The electrode structure is composed of six units, where three units have interdigitated horizontal electrodes, and the other three units have an interdigitated structure with vertical electrodes. The units with horizontal and vertical electrodes are positioned alternatively onto the antenna, allowing the generation of two quasi-half-cycle THz pulses with orthogonal polarization. A time delay between the two THz pulses is introduced by a phase-delay mask covering only the parts of the antenna with horizontal electrodes. By changing the mask thicknesses, we can control on demand, the polarization state of the THz pulses from linear polarization to elliptical to circular polarization over a quarter of a THz cycle.
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Xavier Ropagnol, François Blanchard, and Tsuneyuki Ozaki "Generation of intense terahertz pulses with variable elliptical polarization", Proc. SPIE 12419, Ultrafast Phenomena and Nanophotonics XXVII, 1241902 (15 March 2023); https://doi.org/10.1117/12.2651468
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KEYWORDS
Polarization
Terahertz radiation
Antennas
Elliptical polarization
Picosecond phenomena
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