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Elusive features in photonic and electronic devices can be detected by meansof advanced, time-domain spectroscopic techniques. In this letter we introducea novel kind of modulation spectroscopy, based on the optomechanicalinteraction of photonic and mechanical modes. Applying the technique to a Simetasurface and its drum-like mechanical modes, we detect narrow-bandquasi-Bound-State-in-the-Continuum (q-BIC) modes close to normal incidence,where their measurement can be hindered by a high symmetry protection andundesired background modes. Showing a visibility enhancement of more than oneorder of magnitude, the optomechanical modulation spectroscopy can be aninnovative tool for precise spectroscopy of a wide set of photonic devices,including the goal of measuring purely symmetry protected BIC resonances.

Optomechanical Modulation Spectroscopy of Bound-States-In-The-Continuum in a dielectric metasurface