Fig. 3: Tunable BIC-phonon coupling strength via geometric scaling. | Light: Science & Applications

Fig. 3: Tunable BIC-phonon coupling strength via geometric scaling.

From: Manipulating terahertz phonon-polariton in the ultrastrong coupling regime with bound states in the continuum

Fig. 3

a Transmission amplitude that corresponds to the on-resonance case with the period \(d\) changed, where \({L}_{{\rm{x}}}\) = 50 μm is constant. The red curve represents the experimental data, while the dark dashed line corresponds to the fit obtained from the experimental data. The peaks of polariton are connected by orange dashed lines. b Experimentally measured correlation between Rabi splitting and parameter d, showing monotonic enhancement of splitting magnitude with decreasing d. c The transmission spectra evolution with BIC cavity resonance frequency. The color map represents simulation results implementing both BIC configuration and dual-phonon perovskite oscillator parameters (0.95 + 1.85 THz), while dark markers denote experimentally extracted peak positions of the upper and lower polariton branches

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