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arXiv · 2202.07375

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

S. Zanotto·G. Conte·L. C. Bellieres·A. Griol·D. Navarro-Urrios·A. Tredicucci·A. Martìnez·A. Pitanti
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Abstract

Elusive features in photonic and electronic devices can be detected by means of advanced, time-domain spectroscopic techniques. In this letter we introduce a novel kind of modulation spectroscopy, based on the optomechanical interaction of photonic and mechanical modes. Applying the technique to a Si metasurface and its drum-like mechanical modes, we detect narrow-band quasi-Bound-State-in-the-Continuum (q-BIC) modes close to normal incidence, where their measurement can be hindered by a high symmetry protection and undesired background modes. Showing a visibility enhancement of more than one order of magnitude, the optomechanical modulation spectroscopy can be an innovative tool for precise spectroscopy of a wide set of photonic devices, including the goal of measuring purely symmetry protected BIC resonances.

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S. Zanotto, G. Conte, L. C. Bellieres, A. Griol, D. Navarro-Urrios, A. Tredicucci, A. Martìnez, A. Pitanti. 2022-02-15. Optomechanical Modulation Spectroscopy of Bound-States-In-The-Continuum in a dielectric metasurface. https://doi.org/10.1103/physrevapplied.17.044033

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