Nanostructuring Multilayer Hyperbolic Metamaterials for Enhanced Emission

Abstract

Strong coupling of nano-antenna with the quantum emitters is required for many quantum applications. However, conventional plasmonic antenna suffer high losses due to spectral overlap of scattering and absorption. Previous studies have shown that scattering is the dominating electromagnetic decay channel and that hyperbolic metamaterial cavities have useful properties such as ultrasmall mode volumes and artificially engineered refractive indices which enable the enhancement of light-matter interactions at nanoscale. In this work, I have introduced Ag/SiO$_{2}$ alternating layers based hyperbolic meta-antennas as a potential candidate for separating the spectral overlap of absorption and scattering. I have numerically calculated the absorption and scattering of Ag/SiO$_{2}$ nano-antenna using finite difference time domain (FDTD) method. The interaction between the dye and the nanostructure depends on the shape, size and material used. Therefore the meta-antennas are designed to match the emission peak of LDS dye. Then, the hyperbolic-meta-antenna is fabricated on top glass substrate to study their coupling with LDS 750 dye. I experimentally demonstrate that the scattering overlap with the emission peak of the dyes and the separation of the absorption spectrum play a role in the emission enhancement of the dyes. The photoluminescence measurements show 1.5 enhancement of the emission of LDS dye on top hyperbolic meta-antenna. These meta-antenna can be used to design solid state light sources and quantum technologies.