Fig. 4: Experimental confirmation of Friedrich–Wintgen bound states in the continuum (FW BICs).
From: One-dimensional photonic bound states in the continuum
a Experimental (right panel) and numerical (left panel) transverse magnetic (TM)-polarized reflectance spectra vs liquid-crystal anisotropy axis rotation angle ϕ. Magenta crosses correspond to the asymmetric analytical solutions for BICs and experimental points of resonance collapse. b Spectral branch shows one FW and another symmetry-protected BIC. The blue dashed line shows the analytical dispersion curve for the transverse electric (TE)-polarized microcavity mode. c Experimental (dashed line) and numerical (solid line) TE-polarized reflectance spectra present no resonances.
