Fig. 4: Resonance sweeping of the BZF-qBIC metasurfaces.
From: Trapping light in air with membrane metasurfaces for vibrational strong coupling
a, b, The spectral positions of the qBIC TM resonance modes are tuned by varying the geometric metaunit parameters in double-hole design using scaling parameter s (inset, a). Numerically simulated (a) and measured (b) spectra of the TM modes tuned to a higher wavenumber region than the C = O absorption band to accommodate for the expected redshift upon PMMA deposition into the cavities.
