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Photoswitchable exceptional points derived from bound states in the continuum.

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This study reveals the transition from bound states in the continuum (BICs) to exceptional points (EPs) in non-Hermitian systems. These findings enable dynamic switching and terahertz beam deflection for advanced sensing and control devices.

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Area of Science:

  • Non-Hermitian physics
  • Metasurfaces
  • Terahertz technology

Background:

  • Bound states in the continuum (BICs) and exceptional points (EPs) are critical singularities in non-Hermitian systems.
  • Both phenomena have overlapping applications in sensing and lasers.
  • The transition and interplay between BICs and EPs remain underexplored.

Purpose of the Study:

  • To investigate the transition process from BICs to EPs in a non-Hermitian two-mode system.
  • To experimentally validate the formation of an exceptional ring from quasi-Friedrich-Wintgen BICs.
  • To demonstrate dynamic control and applications of this transition.

Main Methods:

  • Theoretical analysis of a non-Hermitian two-mode system.
  • Experimental realization using patterned dielectric metasurfaces in the terahertz band.
  • Utilizing external pumping to induce photocarriers and control eigenfrequencies.

Main Results:

  • Observed transition from a bound singularity to a 2D exceptional ring.
  • Experimental validation of the EP as a coalescent state of quasi-FW-BICs.
  • Demonstrated dynamic switching of EPs and switchable terahertz beam deflection.

Conclusions:

  • The study elucidates the BIC-EP transition in non-Hermitian systems.
  • Experimental validation confirms the theoretical predictions.
  • Findings pave the way for novel terahertz devices for sensing and wavefront control.