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Sensing with Exceptional Surfaces in Order to Combine Sensitivity with Robustness.

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Researchers developed robust photonic exceptional points (EPs) for advanced sensors. This new design uses an exceptional surface (ES) to maintain sensitivity while tolerating perturbations, overcoming limitations of isolated EPs.

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Area of Science:

  • Non-Hermitian physics
  • Photonics
  • Sensor technology

Background:

  • Exceptional points (EPs) are singularities in non-Hermitian systems, offering high sensitivity for optical sensors.
  • Isolated EPs are highly sensitive to perturbations, limiting practical applications due to fabrication errors and experimental uncertainties.

Purpose of the Study:

  • To introduce a novel design concept for photonic exceptional points (EPs) that enhances robustness against perturbations while retaining sensitivity.
  • To overcome the limitations of isolated EPs in practical sensor applications.

Main Methods:

  • Implementation of a photonic structure featuring a hypersurface of Jordan exceptional points (EPs) embedded in a larger space.
  • Analysis of system behavior under various perturbations, including undesired shifts and backscattering.

Main Results:

  • A large class of perturbations shifts the operating point along the exceptional surface (ES), maintaining the system at another EP, thus ensuring robustness.
  • Perturbations from back reflection or backscattering drive the operating point out of the ES, leading to enhanced sensitivity.
  • The proposed geometry is implementable with standard photonic components.

Conclusions:

  • The developed design offers a robust yet sensitive platform for photonic exceptional points (EPs).
  • This approach addresses the critical challenge of sensitivity to perturbations in EP-based devices.
  • The design concept is extendable to other physical platforms like microwave and acoustics.