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Updated: Jun 19, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Vortex sensing diffraction gratings.

Ignacio Moreno¹, Jeffrey A Davis, B Melvin Pascoguin

¹Departamento de Ciencia de Materiales, Optica y Technología Electrónica, Universidad Miguel Hernández, E03202 Elche, Spain. i.moreno@umh.es

|October 2, 2009

Summary

This summary is machine-generated.

A novel diffraction grating creates multiple vortex patterns to detect the topological charge sign and order of incident vortex beams. Programmable liquid crystal displays (LCDs) offer flexible generation and detection of these optical vortex beams.

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Area of Science:

Optics and Photonics
Diffractive Optics
Quantum Optics

Background:

Optical vortex beams carry orbital angular momentum (OAM), characterized by a topological charge.
Detecting the sign and order of the topological charge is crucial for applications in optical communication and microscopy.
Existing methods for vortex beam characterization can be complex and lack flexibility.

Purpose of the Study:

To develop a versatile and efficient method for detecting the topological charge of optical vortex beams.
To demonstrate a novel diffraction grating capable of generating multiple vortex patterns.
To leverage programmable liquid crystal displays (LCDs) for flexible generation and detection of vortex beams.

Main Methods:

Design and fabrication of a specialized vortex sensing diffraction grating.
Illumination of the grating with various optical vortex beams, including those with fractional topological charges.
Generation of both the diffraction grating and incident vortex beams using two distinct liquid crystal displays (LCDs).

Main Results:

The diffraction grating successfully generated multiple vortex patterns in different diffracted orders.
The sign and order of the topological charge of incident vortex beams were accurately detected.
Experimental validation was achieved for a range of vortex beams, including fractional topological charges.

Conclusions:

The developed vortex sensing diffraction grating provides an effective tool for topological charge detection.
The use of programmable LCDs offers significant flexibility and convenience in generating and characterizing optical vortex beams.
This technique has potential applications in advanced optical systems and OAM-based technologies.