2026-04-13T00:57:01Zhttps://recercat.cat/oai/requestoai:recercat.cat:2445/1246692025-12-05T14:45:35Zcom_2072_1057col_2072_478821col_2072_478917
RECERCAT
author
Martínez-Herrero, Rosario
author
Maluenda Niubó, David
author
Juvells Prades, Ignacio
author
Carnicer González, Arturo
2018-09-18T15:45:00Z2018-09-18T15:45:00Z2018-02-082018-09-18T15:45:00Z
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.
cc-by (c) Martínez-Herrero, Rosario et al., 2018 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess
Polarització (Llum)
Difracció
Feixos de làser
Polarization (Light)
Diffraction
Laser beams
Synthesis of light needles with tunable length and nearly constant irradiance
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion