Applying bound states in the continuum (BICs) in photonic integrated circuits enables low-loss light guidance and routing in low-refractive-index waveguides on high-refractive-index substrates. Here, we demonstrate high-quality integrated lithium niobate microcavities with circulating BICs and further acousto-optically modulate these BICs by surface acoustic waves. The acousto-optic coupling is well situated in the resolved-sideband regime, which leads to coherent coupling between microwave and optical photons, as exhibited by the observed electro-acousto-optically induced transparency and absorption.
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Source: Phys.org