Research On The Influence Of Hyperbolic Metamaterials And Structures On Spontaneous Emissivity And Collection Efficiency Of Quantum Dots

With the rapid development of quantum technology,the application of quantum dots has become more and more extensive.Studies have shown that the environment in which quantum dots are located will highly affect the spontaneous emission rate of quantum dots and the efficiency of radiation collection.The enhancement of quantum dot spontaneous emission and the improvement of radiation collection efficiency can further improve the display effect of quantum dots,the imaging effect of fluorescent probes,and the tracking effect of cell marker molecules.Therefore,researchers have been trying to achieve the desired results through structured designs.In this paper,we introduce the effect of cavities,waveguides,nanoantennas,metamaterials and hybrid structures on the spontaneous emission rate enhancement and radiation collection efficiency of quantum dots.However,it can be seen from the existing research that the high narrow-band spontaneous emission enhancement is often accompanied by the lower broadband radiation collection efficiency.Conversely,the good broadband radiation collection efficiency is improved but the ideal spontaneous emission enhancement effect cannot be obtained.Therefore,comprehensively improving the spontaneous emission rate and radiation collection efficiency of quantum emitters has become the focus of research.Thus,hybrid systems composed of multiple structures have attracted the attention of researchers.We propose a grating-assisted hyperbolic metamaterial structure.The spontaneous emission enhancement is achieved by the near-field coupling of hyperbolic metamaterial and quantum emitters.At the same time,the high refractive index TiO2 grating causes the SPP to be scattered on the grating or reflected back to the emitter,thereby achieving a comprehensive improvement of the spontaneous emission rate and the radiation collection efficiency.In the wavelength range of 570 nm to 770 nm,the peak of radiation collection efficiency reached 68.16%,and the peak of spontaneous emission enhancement reached 28.33.The peak of the product of radiation collection efficiency and spontaneous emission enhancement is 19.00,and the average of the product is 8.87.This average is five times that of the patterned multi-layer metamaterial structure and twice that of the hybrid plasmonic bullseye antennas.The structure we designed has significantly improved the radiation collection efficiency and spontaneous emission enhancement compared with the previous research,and also provides an attractive scheme for future research.