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Researchers demonstrate magnetically induced chiral bound states in the continuum (BICs) with spin-orbit locking. This discovery advances topological photonics by breaking time-reversal symmetry, enabling new spin-selective nanophotonic applications.

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Area of Science:

  • Topological photonics
  • Condensed matter physics
  • Nanophotonics

Background:

  • Bound states in the continuum (BICs) are optical modes with infinite quality factors and topological polarization.
  • BICs have significant interest in fundamental and applied physics.

Purpose of the Study:

  • To investigate the effect of breaking time-reversal symmetry on BICs.
  • To explore the creation of chiral BICs using magnetic fields.
  • To understand the spin-orbit locking properties of these new BICs.

Main Methods:

  • Applying an external magnetic field to a magneto-optical photonic crystal slab.
  • Utilizing multipole analysis to verify angular momenta and spin-orbital-locking.
  • Analyzing momentum space for quality factors and polarization.

Main Results:

  • A new form of chiral BICs with spin-orbit locking was generated by breaking time-reversal symmetry.
  • Doubly degenerate BICs split into chiral BICs with opposite pseudospins and orbital angular momenta.
  • Ultrahigh quality factors and near-circular polarization were observed around chiral BICs.

Conclusions:

  • Magnetically induced chiral BICs exhibit distinct properties and origins compared to conventional BICs.
  • This work significantly advances topological photonics by incorporating broken time-reversal symmetry.
  • Chiral BICs offer potential applications in spin-selective nanophotonics.