AI Article Synopsis
- The study focuses on guided resonances in a thin film lithium niobate photonic crystal, showcasing a resonance quality factor (Q value) of around 1000 for a compact active area.
- These resonances are utilized for electric field sensing, leveraging the electro-optic effect of lithium niobate to enhance sensitivity in applications.
- The research introduces a local field factor to improve the accuracy of simulations and optimize sensor structures, achieving a high sensitivity of 50 μV/m, with potential applications in EEG, ECG, and other electro-optic sensing technologies.
Article Abstract
We present a theoretical study of guided resonances (GR) on a thin film lithium niobate rectangular lattice photonic crystal by band diagram calculations and 3D Finite Difference Time Domain (FDTD) transmission investigations which cover a broad range of parameters. A photonic crystal with an active zone as small as 13μm×13μm×0.7μm can be easily designed to obtain a resonance Q value in the order of 1000. These resonances are then employed in electric field (E-field) sensing applications exploiting the electro optic (EO) effect of lithium niobate. A local field factor that is calculated locally for each FDTD cell is proposed to accurately estimate the sensitivity of GR based E-field sensor. The local field factor allows well agreement between simulations and reported experimental data therefore providing a valuable method in optimizing the GR structure to obtain high sensitivities. When these resonances are associated with sub-picometer optical spectrum analyzer and high field enhancement antenna design, an E-field probe with a sensitivity of 50 μV/m could be achieved. The results of our simulations could be also exploited in other EO based applications such as EEG (Electroencephalography) or ECG (Electrocardiography) probe and E-field frequency detector with an 'invisible' probe to the field being detected etc.
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| http://dx.doi.org/10.1364/OE.24.020196 | DOI Listing |
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