Improving security in terahertz wireless links using beam symmetry of vortex and Gaussian beams

0551647 - FZÚ 2022 RIV US eng J - Journal Article
Troha, Tinkara - Ostatnický, M. - Kužel, Petr
Improving security in terahertz wireless links using beam symmetry of vortex and Gaussian beams.
Optics Express. Roč. 29, č. 19 (2021), s. 30461-30472. ISSN 1094-4087
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GX19-28375X
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : terahertz wireless communication * vortex beam * gaussian beam * eavesdropping
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 3.833, year: 2021
Method of publishing: Open access

We present an effective way to improve the security of a point-to-point terahertz wireless link on a physical layer supported by numerical calculations in the frame of Fourier optics. The improvement is based on original countermeasures which exploit three independent degrees of freedom of the carrier wave: its intensity and azimuthal and radial symmetry. When the transmission line is intercepted, the light beam is subject to changes in either of the three degrees of freedom. We propose a strategy to measure these changes and they are quantified by a single eavesdropping parameter that is shown to be correlated to the secrecy capacity of the transmission. Consequently, its excessive value serves as an indication of the beam interception. We consider the carrier wave in the form of Gaussian and vortex beams. Comparison between the two reveals that vortex beam ensures a even higher level of security.
Permanent Link: http://hdl.handle.net/11104/0326891