In this work, we employ scanning near-field optical microscopy, full-vector finite difference time domain numerical simulations and fractional Fourier transformation to investigate the near-field and propagation behavior of the electromagnetic energy scattered at 1.56μm by dielectric arrays of silicon nitride nanopillars with chiral 1-Vogel spiral geometry. In particular, we experimentally study the spatial evolution of scattered radiation and demonstrate near-field coupling between adjacent nanopillars along the parastichies arms. Moreover, by measuring the spatial distribution of the scattered radiation at different heights from the array plane, we demonstrate a characteristic rotation of the scattered field pattern consistent with net transfer of orbital angular momentum in the Fresnel zone, within a few micrometers from the plane of the array. Our experimental results agree with the simulations we performed and may be of interest to nanophotonics applications.

Near-field distribution and propagation of scattering resonances in Vogel spiral arrays of dielectric nanopillars / F. Intonti;N. Caselli;N. Lawrence;J. Trevino;D. S. Wiersma;L. D. Negro. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - STAMPA. - 15:(2013), pp. 085023-085028. [10.1088/1367-2630/15/8/085023]

Near-field distribution and propagation of scattering resonances in Vogel spiral arrays of dielectric nanopillars

INTONTI, FRANCESCA;CASELLI, NICCOLO';WIERSMA, DIEDERIK SYBOLT;
2013

Abstract

In this work, we employ scanning near-field optical microscopy, full-vector finite difference time domain numerical simulations and fractional Fourier transformation to investigate the near-field and propagation behavior of the electromagnetic energy scattered at 1.56μm by dielectric arrays of silicon nitride nanopillars with chiral 1-Vogel spiral geometry. In particular, we experimentally study the spatial evolution of scattered radiation and demonstrate near-field coupling between adjacent nanopillars along the parastichies arms. Moreover, by measuring the spatial distribution of the scattered radiation at different heights from the array plane, we demonstrate a characteristic rotation of the scattered field pattern consistent with net transfer of orbital angular momentum in the Fresnel zone, within a few micrometers from the plane of the array. Our experimental results agree with the simulations we performed and may be of interest to nanophotonics applications.
15
085023
085028
F. Intonti;N. Caselli;N. Lawrence;J. Trevino;D. S. Wiersma;L. D. Negro
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/864312
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