Publication: Synthesis of light needles with tunable length and nearly constant irradiance
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2018-02-08
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Nature Publishing Group
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Abstract
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 EconomÃa y Competitividad (MINECO) grant number FIS2016-75147-C3-1-P.