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