Adaptive ultrafast nano-optics in a tight focus |
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Authors: | T Brixner FJ García de Abajo C Spindler W Pfeiffer |
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Institution: | 1. Physikalisches Institut, Universit?t Würzburg, Am Hubland, 97074, Würzburg, Germany 2. Centro Mixto CSIC-UPV/EHU, Apartado 1072, 20080, San Sebastián, Spain
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Abstract: | We theoretically demonstrate the control of electromagnetic field properties on a sub-diffraction length scale, by polarization
shaping of tightly focused femtosecond laser pulses. The field distribution in a tight focus is represented as a superposition
of plane waves. The near-field of a model nanostructure is then obtained as a sum of the near-field distributions induced
by the planar waves components. A self-consistent solution of Maxwell’s equations in the frequency domain yields the near-field
distributions for planar wave illumination. Adaptive optimization of the incident polarization pulse shape using an evolutionary
algorithm allows controlling of a number of observables, such as local nonlinear flux, simultaneous spatial and temporal control
of the intensity evolution, and control of the local spectrum. The tight focusing reduces the controllability of the flux
distribution in comparison to plane wave illumination. However, it is still possible to control the spatial and temporal field
evolution for particular locations in the vicinity of the nanostructure.
PACS 42.65.Re; 78.47.+p; 78.67.-n; 82.53.-k |
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