Scientific Results

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

Year: 2013

Authors: Intonti F., Caselli N., Lawrence N., Trevino J., Wiersma D., Dal Negro L.

Autors Affiliation: LENS, Department of Physics, University of Florence, I-50019 Sesto Fiorentino, Italy; Department of Electrical and Computer Engineering, Photonics Center, Boston University, Boston, MA, United States; Division of Materials Science and Engineering, Boston University, Brookline, MA, United States

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 1.56 mu m by dielectric arrays of silicon nitride nanopillars with chiral alpha(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.


Volume: 15      Pages from: 085023-1  to: 085023-12

KeyWords: Fractional Fourier Transformations; Near-field distribution; Orbital angular momentum; Propagation behavior; Scanning near-field optical microscopy; Scattered radiations; Scattering resonance; Time domain numerical simulation, Dielectric materials; Electromagnetic waves; Finite difference time domain method; Orbital transfer; Scattering; Silicon nitride; Nanostructures
DOI: 10.1088/1367-2630/15/8/085023

Citations: 3
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2022-01-16
References taken from IsiWeb of Knowledge: (subscribers only)

This site uses cookies. If you decide to continue browsing we consider that you accept their use. For more information about cookies and how to delete them please read our Info Policy on cookies use.
Read more