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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/124669
Synthesis of light needles with tunable length and nearly constant irradiance
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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.
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MARTÍNEZ-HERRERO, Rosario, et al. Synthesis of light needles with tunable length and nearly constant irradiance. Scientific Reports. 2018. Vol. 8, num. 1, pags. 2657. ISSN 2045-2322. [consulted: 14 of August of 2026]. Available at: https://hdl.handle.net/2445/124669