Orbital angular momentum in the near-field of a fork grating

Autor:	Krispin M. Dettlaff, Elena Mavrona, Peter Zolliker, Erwin Hack
Jazyk:	angličtina
Rok vydání:	2023
Předmět:	Atomic and Molecular Physics and Optics
Zdroj:	Optics Express, 31 (10)
ISSN:	1094-4087
Popis:	Light beams with Orbital Angular Momentum (OAM) are explored in applications from microscopy to quantum communication, while the Talbot effect revives in applications from atomic systems to x-ray phase contrast interferometry. We evidence the topological charge of an OAM carrying THz beam in the near-field of a binary amplitude fork-grating by means of the Talbot effect, which we show to persist over several fundamental Talbot lengths. We measure and analyze the evolution of the diffracted beam behind the fork grating in Fourier domain to recover the typical donut-shaped power distribution, and we compare experimental data to simulations. We isolate the inherent phase vortex using the Fourier phase retrieval method. To complement the analysis, we assess the OAM diffraction orders of a fork grating in the far-field using a cylindrical lens. Optics Express, 31 (10) ISSN:1094-4087
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bbc0c7344493364e4ab725a0c94e0a97 https://hdl.handle.net/20.500.11850/614375 Zobrazit plný text záznamu