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Home Physics

Optical metrology review explores new possibilities with twisted light

Physics by Physics
January 7, 2025
in Physics
Reading Time: 5 mins read
129
A A
0

2025-01-07 02:49:00
phys.org

by Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Metrology gets a new twist
Conceptual notion of twisted light probing a complex medium. An artistic illustration of twisted OAM light passing through a medium, where the OAM spectrum acts as a sensor to monitor its effects. The signature can be read out and analyzed using machine learning and AI algorithms to recognize or sense key features of the medium, as exemplified in the context of a turbulent atmosphere. Credit: Mingjian Cheng, Wenjie Jiang, Lixin Guo, Jiangting Li and Andrew Forbes

Metrology serves as the cornerstone of modern industry, providing the key standards by which we measure the world. Optical metrology, in particular, has historically leveraged the notion of interference, essentially unchanged since the days of Thomas Young more than 200 years ago. However, can one glean more information by extrapolating the concept of fringes to other degrees of freedom?

In a recent paper published in Light: Science & Applications, a team of scientists led by Prof. Lixin Guo from Xidian University have shared their perspectives on the past and future of optical metrology involving orbital angular momentum (OAM).

The paper explores fundamental principles, applications, and seminal advancements in the field. The researchers demonstrate how twisted light carrying OAM can be used for new paradigms in measurement, for instance, 3D particle position tracking, utilizing a modern interpretation of the Doppler effect by observing frequency shifts that depend on both OAM and polarization.

“The original Doppler effect could only track movement toward or away from the observer, but the incorporation of orbital angular momentum in both scalar and vector light allows motion tracking in all directions, including rotational movement,” says Prof. Andrew Forbes, a corresponding author from South Africa. “This advancement has revolutionized the metrology of dynamic systems.”

It is not only the shift in paradigm for existing tools but also the invention of completely new instruments that is propelling the field forward. One such example is the concept of an OAM spectrum serving as the ‘signature’ of a system: when OAM light passes through a complex medium, its OAM is altered, resulting in changes to the shape of the OAM spectrum.

“This OAM fingerprint of the medium contains a wealth of information that can be harnessed,” says Dr. Mingjian Cheng, the lead author.

As the review highlights, if the OAM spectrum is interpreted by machine learning and AI, it opens the door to real-time analysis and recognition of complex media, with OAM light serving as a probe, a topic that is gaining traction very fast.

The review not only covers metrology with classical light but also utilizing OAM in quantum entangled superpositions and single-photon states. Transitioning into the quantum domain holds the potential to reduce noise and enhance accuracy and precision with fewer measurements. However, this aspect of the field remains in its early stages of development.

“Quantum metrology using OAM is still an emerging field with numerous untapped opportunities,” says Prof. Andrew Forbes.

The comprehensive review spans a wide range of applications, from nano-sensing at the microscopic scale to measuring black holes at the cosmic scale.

More information:
Mingjian Cheng et al, Metrology with a twist: probing and sensing with vortex light, Light: Science & Applications (2025). DOI: 10.1038/s41377-024-01665-1

Provided by
Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Citation:
Optical metrology review explores new possibilities with twisted light (2025, January 7)
retrieved 7 January 2025
from https://phys.org/news/2025-01-optical-metrology-explores-possibilities.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.



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