Fig. 4: Radiative quality factor of mechanical BICs at cryogenic temperatures.
From: Observation of phonon trapping in the continuum with topological charges
a Transmission spectrum of a PnC with 200 × 200 unit cells measured at 1 K and 60 mK, showing lower-order B1–BIC standing-wave resonances. The right axis shows the transmission via the three resonances, superposed (black curve) and individual, at 60 mK by removing the substrate background. b Simulated radiative quality factor of the three BIC modes using unit cells with disorders in dimensions \(b^{\prime}\)s and \(c^{\prime}\)s. α is the standard deviation of relative variation. Dashed lines are global fitting using the model of Eq. (2). Error bar represents the standard deviation of Qr (Supplementary Note 2).
