Far-field measurements of vortex beams interacting with nanoholes

Abstract

We measure the far-field intensity of vortex beams going through nanoholes. The process is analyzed in terms of helicity and total angular momentum. It is seen that the total angular momentum is preserved in the process, and helicity is not. We compute the ratio between the two transmitted helicity components, ${\gamma }_{m,p}$. We observe that this ratio is highly dependent on the helicity ($p$) and the angular momentum ($m$) of the incident vortex beam in consideration. Due to the mirror symmetry of the nanoholes, we are able to relate the transmission properties of vortex beams with a certain helicity and angular momentum, with the ones with opposite helicity and angular momentum. Interestingly, vortex beams enhance the ${\gamma }_{m,p}$ ratio as compared to those obtained by Gaussian beams.

References in corpus (10)

• Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
• Observation of the spin-based plasmonic effect in nanoscale structures
• Coriolis Effect in Optics: Unified Geometric Phase and Spin-Hall Effect
• Twisting of light around rotating black holes
• Complete experimental toolbox for alignment-free quantum communication
• A microscopic view of the electromagnetic properties of sub-wavelength metallic surfaces
• Angular momentum-induced circular dichroism in non-chiral nanostructures
• Plasmon assisted transmission of high dimensional orbital angular momentum entangled state
• Isotropically polarized speckle patterns
• Spatial mode properties of plasmon assisted transmission

Cited by in corpus (7)

• A Chirality-Based Quantum Leap
• Achiral, Helicity Preserving, and Resonant Structures for Enhanced Sensing of Chiral Molecules
• Tailoring multipolar Mie scattering with helicity and angular momentum
• Circular Dichroism of Twisted Photons in the Non-Chiral Atomic Matter
• Mimicking Chiral Light-Matter Interaction
• Directional coupling of emitters into waveguides: A symmetry perspective
• Light structuring via nonlinear total angular momentum addition with flat optics