Optically Synthesized Magnetic Fields Enable Spin-Orbit-Coupled Rabi Oscillation

The Rabi oscillation has been proven to be one of the cornerstones of quantum mechanics, triggering substantial investigations in different disciplines including atomic and molecular physics, acoustics, and optics. Various important applications have been demonstrated, ranging from nuclear magnetic resonance imaging and spectroscopy to quantum information processing. So far only two independent classes of wave states in the Rabi oscillations have been revealed as spin waves and orbital waves, while a Rabi wave state simultaneously merging the spin and orbital angular momentum has remained elusive.

In a new paper published in Light Science & Application, a team of scientists, led by Professor Zhen Li and Shenhe Fu from Department of Optoelectronic Engineering, Jinan University, China, and co-workers have reported a new form a Rabi oscillation, being with both spin and orbital angular momentum. To reveal this fundamental phenomenon, they constituted a pseudo spin-1/2 formalism and optically synthesized a controllable magnetic field in the light-crystal interaction process. Based on this formulism, they observed simultaneous oscillations of the spin and orbital angular momentum in weak and strong coupling regimes, driven by the beam-dependent synthetic magnetic field. Furthermore, they introduced an electrically tunable platform, allowing a fine control of transition between different Rabi oscillatory modes, resulting in an emission of orbital-angular-momentum beams with tunable topological structures. Their results constitute a general framework to explore spin-orbit couplings in the higher-order regime, offering routes to manipulating the spin and orbital angular momentum of light in three and four dimensions. The reported method and technique will find potential applications both in classical and quantum optics.

The observed spin-orbit-coupled Rabi oscillation is manifested by simultaneous oscillations of spin and orbital angular momentum with the coupling length, in the presence of the optically synthesized magnetic fields. The scientists summarize the findings:

"We constitute a pseudospin-1/2 formalism in an analogy to Pauli equation describing the spinning of a quantum particle and optically synthesize a magnetic field through light-crystal interaction. In the system, we define the right- and left-handed circularly polarized vortex beams as the spin-up and spin-down equivalents coupled by the synthesized magnetic fields, which can be fully controlled by either structuring the light beam or engineering the crystal."

"Structured light comprising a superposition of spin and orbital angular momentum states has drawn considerable interest since it holds a promise for multidimensional high-capacity data multiplexing. Our platform allows spatiotemporal modulations of the synthesized magnetic fields, enabling to manipulate the structured light beams in three- and four-dimensional configurations." they added.

"Since the setting is equivalent to those described by the Pauli equations such as in quantum mechanics and nonlinear optics, our results open new possibilities for spinor manipulation in the higher-order regime." the scientists forecast.

Source: https://english.cas.cn/

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type
Submit
Azthena logo

AZoM.com powered by Azthena AI

Your AI Assistant finding answers from trusted AZoM content

Your AI Powered Scientific Assistant

Hi, I'm Azthena, you can trust me to find commercial scientific answers from AZoNetwork.com.

A few things you need to know before we start. Please read and accept to continue.

  • Use of “Azthena” is subject to the terms and conditions of use as set out by OpenAI.
  • Content provided on any AZoNetwork sites are subject to the site Terms & Conditions and Privacy Policy.
  • Large Language Models can make mistakes. Consider checking important information.

Great. Ask your question.

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.