Tailoring multipolar Mie scattering with helicity and angular momentum

Abstract

Linear scattering processes are usually described as a function of the parameters of the incident beam. The wavelength, the intensity distribution, the polarization or the phase are among them. Here, we discuss and experimentally demonstrate how the angular momentum and the helicity of light influence the light scattering of spherical particles. We measure the backscattering of a $4\mu m$ TiO${}_2$ single particle deposited on a glass substrate. The particle is probed at different wavelengths by different beams with total angular momenta ranging from $-8$ to $+8$ units. It is observed that the spectral behavior of the particle is highly dependent on the angular momentum and helicity of the incoming beam. While some of the properties of the scattered field can be described with a simple resonator model, the scattering of high angular momentum beams requires a deeper understanding of the multipolar modes induced in the sphere. We observe that tailoring these induced multipolar modes can cause a shift and a spectral narrowing of the peaks of the scattering spectrum. Furthermore, specific combinations of helicity and angular momentum for the excitation lead to differences in the conservation of helicity by the system, which has clear consequences on the scattering pattern.

References in corpus (12)

• Strong magnetic response of submicron Silicon particles in the infrared
• Electric and magnetic dipolar response of Germanium spheres: Interference effects, scattering anisotropy and optical forces
• Electromagnetic duality symmetry and helicity conservation for the macroscopic Maxwell's equations (previously "Experimental demonstration of electromagnetic duality symmetry breaking")
• Purcell factor of Mie resonators featuring electric and magnetic modes
• On the experimental investigation of the electric and magnetic response of a single nano-structure
• Helicity and Angular Momentum. A Symmetry based framework for the study of Light-Matter Interactions
• Angular momentum-induced circular dichroism in non-chiral nanostructures
• Excitation of single multipolar modes with engineered cylindrically symmetric fields
• Dual and anti-dual modes in dielectric spheres
• The role of the angular momentum of light in Mie scattering. Excitation of dielectric spheres with Laguerre-Gaussian modes
• Extraordinary transmission through a single coaxial aperture in a thin metal film
• Far-field measurements of vortex beams interacting with nanoholes

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• Symmetry-protection of multiphoton states of light
• Characterizing the Backscattered Spectrum of Mie Spheres
• Directional coupling of emitters into waveguides: A symmetry perspective
• Microsphere kinematics from the polarization of tightly focused nonseparable light
• Detection of Hybrid Optical Anapoles in Dielectric Microspheres