| Summary: | A novel photonic/plasmonic cavity based on a 1-D photonic crystal cavity vertically coupled to a plasmonic gold structure is reported. The design has been optimized to achieve an ultra-high Q/V ratio, therefore improving the light-matter interaction and making the device suitable for optical trapping applications. Accurate 3-D finite element method (FEM) simulations have been carried out to evaluate the device behavior and performance. The device shows Q = 2:8 × 10<sup>3</sup> and V = 4 × 10<sup>-4</sup>(λ=n)<sup>3</sup>, which correspond to a Q=V = 7 × 10<sup>6</sup>(λ=n)<sup>-3</sup> with a resonance transmission around 50% at λ<sub>R</sub> = 1589:62 nm. A strong gradient of the optical energy has been observed in the metal structure at the resonance, inducing a strong optical force and allowing a single particle trapping with a diameter less than 100 nm. The device turns out very useful for novel biomedical applications, such as proteomics and oncology.
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