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Synthesis of light needles with tunable length and nearly constant irradiance Martínez-Herrero, Rosario Maluenda Niubó, David Juvells Prades, Ignacio Carnicer González, Arturo Polarització (Llum) Difracció Feixos de làser Polarization (Light) Diffraction Laser beams We introduce a new method for producing optical needles with tunable length and almost constant irradiance based on the evaluation of the on-axis power content of the light distribution at the focal area. According to theoretical considerations, we propose an adaptive modulating continuous function that presents a large derivative and a zero value jump at the entrance pupil of the focusing system. This distribution is displayed on liquid crystal devices using holographic techniques. In this way, a polarized input beam is shaped and subsequently focused using a high numerical aperture (NA) objective lens. As a result, needles with variable length and nearly constant irradiance are produced using conventional optics components. This procedure is experimentally demonstrated obtaining a 53λ-long and 0.8λ-wide needle. 2018-09-18T15:45:00Z 2018-09-18T15:45:00Z 2018-02-08 2018-09-18T15:45:00Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1038/s41598-018-21007-7 Scientific Reports, 2018, vol. 8, num. 1, p. 2657 https://doi.org/10.1038/s41598-018-21007-7 cc-by (c) Martínez-Herrero, Rosario et al., 2018 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess Nature Publishing Group Articles publicats en revistes (Física Aplicada)