Synthesis of light needles with tunable length and nearly constant irradiance
| Autor: | David Maluenda, Rosario Martínez-Herrero, Ignasi Juvells, Artur Carnicer |
|---|---|
| Přispěvatelé: | Universitat de Barcelona |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Irradiance Holography lcsh:Medicine Polarització (Llum) 02 engineering and technology Derivative 01 natural sciences Article law.invention 010309 optics Entrance pupil Optics law 0103 physical sciences Optica lcsh:Science Polarization (Light) Óptica Multidisciplinary business.industry lcsh:R 021001 nanoscience & nanotechnology Numerical aperture Lens (optics) Difracció Feixos de làser lcsh:Q 0210 nano-technology business Constant (mathematics) Diffraction Beam (structure) Laser beams |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid Scientific Reports, Vol 8, Iss 1, Pp 1-10 (2018) E-Prints Complutense. Archivo Institucional de la UCM instname Recercat. Dipósit de la Recerca de Catalunya Scientific Reports |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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