Title:
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Synthesis of light needles with tunable length and nearly constant irradiance
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Author:
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Martínez-Herrero, Rosario; Maluenda Niubó, David; Juvells Prades, Ignacio; Carnicer González, Arturo
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Polarització (Llum) -Difracció -Feixos de làser -Polarization (Light) -Diffraction -Laser beams |
Rights:
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cc-by (c) Martínez-Herrero, Rosario et al., 2018
http://creativecommons.org/licenses/by/3.0/es |
Document type:
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Article Article - Published version |
Published by:
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Nature Publishing Group
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