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Over the last few years, optical nanoantennas are continuously attractinginterest owing to their ability to efficiently confine, localize resonance, andsignificantly enhanced electromagnetic fields at subwavelength scale. However,such strong confinement can be further enhanced by using an appropriatecombination of optical nanoantenna and Slanted Bound states in the continuumcavities. Here, we propose to synergistically bridge the plasmonic nanoantennaand high optical quality-factor cavities to numerically demonstrate threeorders of magnitude local intensity enhancement. The proposed hybrid systempaves a new way for applications requiring highly confined fields such asoptical sensing, optical trapping, nonlinear optics, quantum optics, etc.

Efficient coupling between slanted bound states in the continuum cavity and plasmonic nanoantennas induced local field enhancement