Synthesis of light needles with tunable length and nearly constant irradiance



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Martínez Herrero, Rosario and Maluenda, David and Carnicer, Artur (2018) Synthesis of light needles with tunable length and nearly constant irradiance. Scientific reports, 8 . ISSN 2045-2322

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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 53 lambda-long and 0.8 lambda-wide needle.

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© The Author(s) 2018.
R.M.H. and A.C. acknowledges support from Ministerio de Economía y Competitividad (MINECO) grant number FIS2016-75147-C3-1-P.

Uncontrolled Keywords:Longitudinally polarized-light; Beam generation; Optical-systems; Depth; Focus; Diffraction; Modulation; Filter; Plane; Lens
Subjects:Sciences > Physics > Optics
ID Code:46836
Deposited On:15 Mar 2018 17:01
Last Modified:15 Mar 2018 17:01

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