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

TL;DR

This paper demonstrates a hybrid system combining plasmonic nanoantennas with high-Q cavities, achieving three orders of magnitude local field enhancement for advanced optical applications.

Contribution

It introduces a novel coupling method between bound states in the continuum cavities and plasmonic nanoantennas for enhanced field confinement.

Findings

Achieved three orders of magnitude local intensity enhancement.

Proposed hybrid system suitable for sensing, trapping, and nonlinear optics.

Numerical demonstration of efficient coupling in the system.

Abstract

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.