Experimental study demonstrates symmetry-protected bound states in a silicon grating on lithium niobate, highlighting multi-task sensing and nonlinear optical modulation.
In this article, we present an experimental study supported by numerical modeling showing the possibility of exciting Symmetry-Protected Bound states In the Continuum (SP-BICs) in a 1D silicon grating fabricated on a lithium niobate substrate in both transverse electric and transverse magnetic polarization states of the incident illumination. This leads to different resonances in the transmission spectra with large quality factors up 10⁶ and a significant electric/magnetic field enhancement up to 10⁵ opening the way to the exploitation of this structure for different sensing applications (biological, electromagnetic, thermal...) but also to nonlinear applications such as the generation of second harmonic, in addition to electro- and acousto-optic modulation.
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Boublouh et al. (2024) studied this question.
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