Abstract: It is disclosed a device for multipole phase division multiplexing and demultiplexing and a spatial division telecommunications system comprising the multiplexing and demultiplexing devices. The multipole phase demultiplexing device comprises a cascade of a beam transformer and a phase corrector, wherein the beam transformer performs a circular-sector transformation of a plurality of multipole phase electromagnetic beams. The multipole phase multiplexing device comprises a cascade of a beam transformer and a phase corrector, wherein the beam transformer performs a combination of |m | circular-sector transformations of a plurality of tilted electromagnetic beams.

Abstract: It is disclosed a device for multipole phase division multiplexing and demultiplexing and a spatial division telecommunications system comprising the multiplexing and demultiplexing devices. The multipole phase demultiplexing device comprises a cascade of a beam transformer and a phase corrector, wherein the beam transformer performs a circular-sector transformation of a plurality of multipole phase electromagnetic beams. The multipole phase multiplexing device comprises a cascade of a beam transformer and a phase corrector, wherein the beam transformer performs a combination of |m | circular-sector transformations of a plurality of tilted electromagnetic beams.

Abstract: A mode division demultiplexing optical communication system comprises a multimode optical fiber, an optical device for demultiplexing modes with a different orbital angular momentum and a diffractive optical element. The optical fiber is configured to: receive at the input a first optical signal carried by a first guided mode having an orbital angular momentum, generate at the output the first optical signal carried by a first group of guided modes. The optical demultiplexing device is configured to: receive at the input a free space optical beam, generate at the output a first pair of free space optical beams. The diffractive optical element is configured to: receive at the input the first pair of free space optical beams and generate therefrom at the output a first pair of collimated optical beams, converge the first pair of collimated optical beams into a same first point in the space.

Abstract: A method and a system for the enhancement of the sensitivity in surface plasmon resonance (SPR) sensors based metallic grating by exploiting the conical configuration is presented. We consider the propagation of surface plasmon polaritons (SPPs) excited by light from the visible to infrared spectrum range, incident on a plasmonic grating at different directions by varying both the zenith and azimuthal angles. For specific azimuthal angles, SPPs propagate in the grating plane perpendicular to the incident light momentum. This is the condition that allows increasing the number of different excited SPPs modes largely. We exploit this effect to increase the sensor sensitivity with the change of refractive index of thin film on the plasmonic grating surface. Polarization effects also contribute to a further modes enhancement and increase the sensitivity. A scheme for a lab-on-chip implementation of a system that allows a parallel detection in microfluidic channels has been shown.

Abstract: A method and a system for the enhancement of the sensitivity in surface plasmon resonance (SPR) sensors based metallic grating by exploiting the conical configuration is presented. We consider the propagation of surface plasmon polaritons (SPPs) excited by light from the visible to infrared spectrum range, incident on a plasmonic grating at different directions by varying both the zenith and azimuthal angles. For specific azimuthal angles, SPPs propagate in the grating plane perpendicular to the incident light momentum. This is the condition that allows increasing the number of different excited SPPs modes largely. We exploit this effect to increase the sensor sensitivity with the change of refractive index of thin film on the plasmonic grating surface. Polarization effects also contribute to a further modes enhancement and increase the sensitivity. A scheme for a lab-on-chip implementation of a system that allows a parallel detection in microfluidic channels has been shown.