Pulsed terahertz vortex beams: generation and properties

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• Maksim Kulya (ITMO university)
• Wednesday 12 May 2021, 16:00-17:00
• https://bham-ac-uk.zoom.us/j/87841200425?pwd=ZzJrVE1pNHFGbm0wblM0alRYSllLUT09.

If you have a question about this talk, please contact Dr Miguel Navarro-Cia.

Zoom Meeting ID: 878 4120 0425

Pulsed broadband THz vortices are promising for wireless communication systems. Despite the fact that a broadband vortex can usually be considered as a superposition of vortices on each individual spectral component, its characteristics as a whole beam differ significantly compared to monochromatic vortices. These differences may not be noticeable when considering beam propagation in free space, but they affect propagation in media with refractive index dispersion, with strong non-paraxial diffraction or with amplitude and phase obstacles in the propagation track. Thus, the strong frequency dependency of the parameters of each vortex monochromatic component, leads to significant changes in broadband vortex structure of the wave as a whole. The aspects to be considered are: i) the use of the properties of pulsed broadband terahertz radiation consisting of several electric field oscillations; ii) the use of vortex beams carrying a single topological charge on a large number of spectral components; iii) investigation of the self-healing properties of broadband vortex beams with an integral topological charge during the passage of amplitude obstacles and a path with phase inhomogeneities.

This talk is part of the Metamaterials and Nanophotonics Group Seminars series.

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• Bham Talks
• Metamaterials and Nanophotonics Group Seminars
• What's on in Physics?
• https://bham-ac-uk.zoom.us/j/87841200425?pwd=ZzJrVE1pNHFGbm0wblM0alRYSllLUT09

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