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

Intonti, Francesca; Caselli, Niccolo'; Lawrence, N.; Trevino, J.; Wiersma, Diederik Sybolt; Negro, L. D.

doi:10.1088/1367-2630/15/8/085023

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]

trova@unifi

Titolo:	Near-field distribution and propagation of scattering resonances in Vogel spiral arrays of dielectric nanopillars
Autori di Ateneo:	INTONTI, FRANCESCA CASELLI, NICCOLO' N. Lawrence J. Trevino WIERSMA, DIEDERIK SYBOLT L. D. Negro mostra contributor esterni nascondi contributor esterni
Autori:	INTONTI, FRANCESCA; CASELLI, NICCOLO'; N. Lawrence; J. Trevino; WIERSMA, DIEDERIK SYBOLT; L. D. Negro
Anno di registrazione:	2013
Rivista:	NEW JOURNAL OF PHYSICS
Volume:	15
Pagina iniziale:	085023
Pagina finale:	085028
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.
Handle:	http://hdl.handle.net/2158/864312
Appare nelle tipologie:	1a - Articolo su rivista

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