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We discovered new spectral singularities by combining two unique singularities. This breakthrough allows for infinite reflection on one side and zero on the other, a key advance in resonance trapping.

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Area of Science:

  • Physics
  • Optical Engineering
  • Materials Science

Background:

  • Spectral singularities are points where system responses diverge.
  • Fano resonances and parity-time (PT) symmetry are crucial in manipulating wave phenomena.
  • Previous research focused on single singularities, limiting control over directional responses.

Purpose of the Study:

  • To propose and investigate a novel class of spectral singularities.
  • To explore the role of resonance trapping via PT symmetry and Fano resonances.
  • To demonstrate simultaneous asymmetric reflection and transmission properties.

Main Methods:

  • Theoretical modeling of coupled singularities.
  • Analysis of interplay between PT symmetry and Fano resonances.
  • Numerical simulations to verify spectral singularity emergence and directional responses.

Main Results:

  • A new class of spectral singularities was theoretically proposed.
  • Resonance trapping induced by PT symmetry and Fano resonances was identified as the mechanism.
  • Simultaneous infinite reflection from one side and zero reflection from the opposite side was achieved in a reciprocal system.

Conclusions:

  • The proposed spectral singularities offer unprecedented control over wave reflection and transmission.
  • This work opens new avenues for designing advanced optical and acoustic devices.
  • The findings highlight the potential of combining PT symmetry and Fano resonances for novel functionalities.