Abstract
A hybrid plasmonic–phononic cavity design which enables high vacuum coupling rate has been proposed in lithium niobate (LN) phononic crystals (Phncs) that have been perforated by air holes and coated with thin silver film. By tailoring the geometry, optomechanical interaction between the plasmonic modes (produced by the metal/insulator) and the phononic modes (confined by the phononic bandgap effect) is greatly enhanced. Numerical results based on finite-element method (FEM) reveal that in this hybrid plasmonic–phononic design, high vacuum coupling rate that predominantly contributed by moving boundary effect is on the order of 106 Hz, which is about one to two orders higher than that contributed by photoelastic effect shown in conventional phoxonic crystal designs. Results evidence how the vacuum coupling rate depends on geometrical parameters like the radius of the defect air hole, the thickness of silver layer, and LN layer. The simultaneous confinement and strong coupling, combined with other advantages as lack of constraint to the refractive index, and integration of piezoelectric material and metal in a chip, this hybrid design may be suitable for non-invasive biological sensing, optomechanically tunable plasmonic heater for drug release and lab-on-chip devices.
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Acknowledgements
The authors gratefully acknowledge the National Natural Science Foundation of China (Grant No. 61275043, 61605128), Natural Science Foundation of Guangdong Province (Grant No. 2017A030310455), Shenzhen Science & Technology Foundation (Grant No. JCYJ20180305124247521) and Start-up Funds for New Teachers of Shenzhen University (Grant No. 2016024). The authors would also like to thank Mr. Chi Zhang who assisted in editing the revised manuscript.
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Liu, Q., Lu, H., Bibbó, L. et al. Hybrid plasmonic–phononic cavity design for enhanced optomechanical coupling in lithium niobate. Appl Nanosci 10, 1395–1407 (2020). https://doi.org/10.1007/s13204-020-01371-5
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DOI: https://doi.org/10.1007/s13204-020-01371-5