Precise detection of tiny birefringence with accuracy reaching 10^-11 level

Area of Science:

• Optics and Photonics
• Quantum Information Science
• Materials Science

Background:

• High-precision birefringence detection is vital for applications like chirality detection, optical clocks, and quantum information.
• Existing methods for detecting birefringence in optical materials are limited, typically achieving precision around 10^-8.

Purpose of the Study:

• To introduce a novel physical mechanism for birefringence detection in the classical regime.
• To achieve unprecedented detection accuracy at the 10^-11 level.

Main Methods:

• Utilizing an effective photonic two-level system driven by a synthetic magnetic field.
• Employing propagation-invariant spin-orbit-coupled structured light in the subwavelength regime to generate the magnetic field.
• Observing Rabi oscillations of the photonic state and spin-orbital angular momentum conversion.

Main Results:

• Demonstrated a birefringence detection accuracy at the 10^-11 level, significantly surpassing current techniques.
• Achieved ultrahigh precision through a topological transition in oscillatory modes with high Rabi frequencies.
• Showcased tunable detection precision by controlling the subwavelength envelope size of structured light.

Conclusions:

• The developed technique offers a significant advancement in birefringence detection precision.
• This method has broad applicability in fundamental research and applied fields requiring precise optical measurements.
• The tunable nature of the technique allows for tailored applications in diverse optical systems.