Aiello, AndreaPaúr, MartinStoklasa, BohumilHradil, ZdenekŘeháček, JaroslavSánchez Soto, Luis Lorenzo2023-06-172023-06-172020-09-152578-751910.1364/OSAC.400410https://hdl.handle.net/20.500.14352/7501© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. European Union Horizon 2020 (732894); Grantová Agentura Ceské Republiky (18-04291S); Palacký University (GA_PrF_2020_004); Ministerio de Ciencia e Innovación (PGC2018-099183-B-I00).We report the first, to the best of our knowledge, observation of concentrating paraxial beams of light in a linear nondispersive medium. We have generated this intriguing class of light beams, recently predicted by one of us, in both one- and two-dimensional configurations. As we demonstrate in our experiments, these concentrating beams display unconventional features, such as the ability to strongly focus in the focal spot of a thin lens like a plane wave, while keeping their total energy finite.engAtribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/journal articlehttps://doi.org/10.1364/OSAC.400410https://www.osapublishing.orgopen access535OpticsÓptica (Física)2209.19 Óptica Física