Hybrid Plasmonic-Dielectric Geometric Metasurfaces for Emission Control and Chiral Sensing

Metasurface has advanced the field of optics for the past decade thanks to the great turnability with multiple degree of freedom. By coupling the geometric plasmonic metasurfaces with the dielectric Si cavity mode, the direction and polarization of photon emission can be controlled. The hybrid structure with desired configuration presents the highest electric field and the best cross-polarization conversion efficiency while maintaining the Purcell factor. The Pancharatnam-Berry (PB) phase construction to manipulate the emission wavefront of both dipole emitter and chiral emitter is successfully demonstrated with simulation. The enantiomeric interaction between circular polarized light and the chiral molecule offers the significant feature for sensing application. To increase the selectivity for real-time chiral sensing, we employ the P-B phase antenna with silicon disk metamaterials. The improvement of Circular Dichroism (CD) measurement is also realized with the L-glucose and D-glucose.