Biomedical Engineering Reference
In-Depth Information
Chapter 11
Engineering the Orbital Angular
Momentum of Light with Plasmonic
Vogel Spiral Arrays
Luca Dal Negro, Nate Lawrence, and Jacob Trevino
Electrical and Computer Engineering, Boston University, 8 Saint Mary's Street,
Boston, MA 02139, USA
dalnegro@bu.edu
In this chapter, we present our work on the engineering of
structured light with orbital angular momentum (OAM) using
aperiodicarraysofmetallicnanoparticlesarrangedwithVogelspiral
geometry. In particular, we introduce and discuss the distinctive
structural properties of different types of Vogel spirals and we
demonstrate the ability to encode specific numerical sequences,
determined by the aperiodic geometry, onto the azimuthal OAM
values of diffracted optical beams. Finally, using Fourier-Hankel
mode decomposition and interferometric reconstruction of the
complexscatteredfar-fields,weproveexperimentallythecontrolled
generation of large OAM azimuthal values, in excellent agreement
with analytical scattering theory. The engineering of diffracted
beams with controllable OAM spectra using flat aperiodic plasmon
