Bound states in the continuum are identified by their insensitivity to outer boundary variations, visualized via spectral histograms, rather than by computing radiation losses through complex eigenvalues.
1b is obtained by solving the acoustic Helmholtz equation when the unit cell is surrounded by a perfectly matched layer (PML), as depicted in Fig
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Identifying bound states in the continuum by their boundary sensitivity
Bound states in the continuum are identified by their insensitivity to outer boundary variations, visualized via spectral histograms, rather than by computing radiation losses through complex eigenvalues.